英単語帳

Asphalt, concrete, and dark roofs absorb more of the Sun’s energy.

France adopted it in 1854, two years after his death.

Because of this, a star may appear brighter, then darker.

The farther the lightning is, the longer the sound takes to arrive.

Every mass measurement worldwide theoretically depended on a chain of comparisons leading back to that single artifact.

Before it reaches our eyes, the light passes through Earth’s atmosphere.

When sunlight enters Earth's atmosphere, it meets tiny parts of air.

The user sees a simple route on a screen, while the system behind it depends on satellites, ground control, atomic clocks, and mathematics.

The important reason is Earth’s tilted axis.

Cold temperatures slow the growth of many bacteria.

A battery may look like a small box that stores energy.

When sunlight enters a droplet, it slows down and bends.

In spring or autumn, you may see birds flying in a V shape.

We may yawn when we are sleepy, tired, or bored.

When people make bread, they often add yeast to the dough.

This gas forms small bubbles inside the dough.

Metal objects were produced to serve as prototypes of the metre and kilogram, and other instruments were calibrated through comparisons with them.

A camera collects light from that moment and records it as an image.

A chemical reaction happens inside it.

A small chemical reaction happens inside the onion when it is cut.

Scientists sometimes describe this large circulation as a global conveyor belt.

Forgetting therefore supports flexibility when rules, relationships, or circumstances change.

Researchers record brain activity, eye movement, and muscle condition to classify sleep into two broad types: non-REM sleep and REM sleep.

Rain falls from clouds.

Clouds look soft, like cotton in the sky.

In the United States, a law for surveying the coast was signed in 1807.

Different combinations could represent letters, numbers, and punctuation.

Leaves are green because they contain chlorophyll.

This approach, known as surveillance and containment, created a ring of immunity around each chain of infection.

This movement is called an ocean current.

In a QR code, the order of the small squares represents data.

In other words, ice has lower density than liquid water.

Currents are driven by wind, tides, and differences in water density.

It shows coastlines, ports, water depth, routes, and dangerous places.

The router sends small signals, and your device sends signals back.

This small difference is almost six hours each year.

The direction of her body tells other bees which way to fly.

The light then scatters in different directions.

The green color slowly disappears.

Years divided by 100 are usually not leap years, unless they can also be divided by 400.

When people make bread, they often add yeast to the dough.

There are tiny water drops inside a cloud.

They are made of very small water droplets or ice crystals.

A rainbow needs sunlight, water droplets in the air, and a viewer in the right position.

This happens because Earth rotates.

Magnitude describes the size of the earthquake itself.

When a finger comes close, the electrical state changes in one place.

But a battery does not just store electricity.

The birds behind can save energy by using that moving air.

Smallpox is the only human infectious disease that has been eradicated worldwide.

Instruments called seismographs record those waves, and scientists use the records to estimate the earthquake’s size.

In forests and fields, trees provide shade, while evaporation from plants and soil cools the environment.

Visitors read newspapers, discussed politics, listened to the latest news, and exchanged ideas with people from different occupations.

The extra time does not disappear.

Underground, a fault slips and releases energy.

Their bodies have thick feathers and fat.

Many touchscreens read a small change when a finger touches the glass.

Instead of copying shapes designed for the eye, it was designed for the fingertip.

The sender would pay a low, fixed price before sending a letter.

It floats on the top.

This happens because there is an invisible force around the magnet.

Even when we cannot see it, dirt and germs can stay on our hands.

They can warn sailors about rocks, shallow water, or the entrance to a harbor.

The fat keeps heat inside their bodies.

When a drop becomes too heavy, it cannot stay in the cloud.

When the Northern Hemisphere tilts toward the Sun, it has summer.

When a worker finds flowers, she returns to the hive and does a special dance.

When you put ice in a glass of water, it does not sink.

A camera collects light from that moment and records it as an image.

The vaccine was indispensable, but it reached its full power only when combined with dependable records, rapid response, field workers, public participation, and cooperation between nations.

The same idea also shows why infrastructure can be fragile.

A measurement system is therefore not merely a collection of rulers and weights; it is also an infrastructure of trust.

To understand earthquakes, we need to separate at least two ideas: magnitude and shaking intensity.

In 1840, Britain introduced the Penny Black, the world's first postage stamp.

In 2018, national representatives voted to redefine the kilogram and several other units through invariant constants of nature.

This happens because there is an invisible force around the magnet.

The leading bird may get tired, so birds sometimes take turns at the front.

Finally, the water reaches the leaves.

Milk, eggs, fish, meat, salads, and leftovers became easier to plan.

First, light passes through a lens.

A lighthouse is a tall building near the sea.

When lightning happens, we often see a bright flash first.

A magnet can pull some things made of iron.

News about earthquakes often focuses on one number, such as “magnitude 7.

However, the materials inside the battery are used little by little.

Merchants met customers, compared prices, and arranged deals.

Some metals with iron feel the magnetic force strongly.

When water freezes, its molecules form a fixed pattern.

In fifteenth-century Western Europe, Johannes Gutenberg developed printing with metal movable type and a mechanical press.

That is why sailors use nautical charts.

As telegraph networks later expanded, people could learn about distant events much sooner than before.

Cutting an onion can make your eyes hurt and fill with tears.

To see a rainbow, the Sun is usually behind you and the rainbow is on the opposite side.

As the Moon orbits Earth, we see different amounts of its bright half.

2422 days to orbit the Sun.

The story of the ozone layer is unusual among environmental problems because it allows cautious hope.

They may look like simple patterns, but they hold information.

Light-colored roofs and pavements can reflect more sunlight instead of absorbing it.

This creates the Moon’s phases.

Plants do not have mouths, but they still need water.

Before refrigerators became common, people used salt, drying, ice, and cool underground spaces to preserve food.

Before printing spread, books were rare objects.

Cities place millions of people within physical proximity, yet urban residents frequently report profound feelings of isolation.

When this chemical reaches your eyes, your eyes try to protect themselves.

Protecting wetlands protects nature, but it also protects human life.

Cities place millions of people within physical proximity, yet urban residents frequently report profound feelings of isolation.

QR codes are made of small black and white squares.

Rain falls from clouds.

A small chemical reaction happens inside the onion when it is cut.

Yawning is a very normal body reaction.

Usually, the person who received the letter had to pay.

A receiver in a phone, car, ship, or aircraft compares the arrival times of several signals.

Scientists expect continued declines to support a near complete recovery of the ozone layer around the middle of the twenty-first century, although the exact timing varies by region and by measurement.

Moonlight is sunlight reflected from its surface.

The light reflects inside the droplet and separates into different colors.

Refrigeration changed that problem.

These surfaces store heat during the day and release it slowly after sunset.

That is why day and night repeat every day.

In the code developed by Samuel Morse and Alfred Vail, combinations of short and long signals represented letters and numbers.

But printing made it easier to reproduce the same text many times.

Then clean running water can rinse it away.

They take in water from the soil through their roots.

This happens because Earth rotates.

Your phone or computer shares information with a nearby router.

Rubbing is also important.

They can warn sailors about rocks, shallow water, or the entrance to a harbor.

GPS satellites continuously send signals from space.

The light then scatters in different directions.

But that is not the main reason for the seasons.

In a digital camera, this surface is called a sensor.

In spring or autumn, you may see birds flying in a V shape.

The router sends small signals, and your device sends signals back.

Signals could move through a wire, allowing words to travel without a physical letter.

We may yawn when we are sleepy, tired, or bored.

However, soap works better.

The light and the sound come from the same lightning, but they do not travel at the same speed.

Food does not become safe forever, but it spoils more slowly.

Before printing spread, books were rare objects.

Starlight travels from space to Earth.

The water moves up through small tubes in the stem.

This substance helps plants use sunlight to make food.

A teacher named Rowland Hill suggested a simpler system.

Sunlight looks white, but it is made of many colors.

Moonlight is sunlight reflected from its surface.

This pattern is called an urban heat island because the city becomes an island of higher temperature than its surrounding areas.

Instead of depending only on attempts to vaccinate everyone at once, health officials built surveillance systems to find and report new cases quickly.

Yet GPS time is also used to synchronize communication networks, financial systems, and parts of the electric grid.

They take turns standing on the cold outside and the warm inside.

These places offered something different from traditional taverns.

Their bodies have thick feathers and fat.

People sometimes count the seconds between the flash and the thunder.

The important reason is Earth’s tilted axis.

Many touchscreens read a small change when a finger touches the glass.

Its first stage is a short transition between wakefulness and sleep.

On May 24, 1844, Morse transmitted a famous message from Washington, D.

Investigations continued afterward to make sure transmission had truly stopped.

In 1987, countries agreed to the Montreal Protocol, a treaty designed to reduce the production and use of ozone-depleting substances.

We say they twinkle.

The ozone layer sits in the stratosphere and absorbs part of the Sun’s harmful ultraviolet radiation.

Warm air can hold water vapor.

Then other colors that were already in the leaves become visible.

Vivid dreams often occur during REM sleep, although the major muscles normally become very relaxed.

Watching clouds is a simple way to think about the weather.

Wetlands are places where land and water meet.

With Wi‑Fi, you can connect to the internet without using a cable.

When a worker finds flowers, she returns to the hive and does a special dance.

We may yawn when we are sleepy, tired, or bored.

When people make bread, they often add yeast to the dough.