Name: 地球：兒童天文學和太空 - FreeSchool (The Planet Earth: Astronomy and Space for Kids - FreeSchool)
Uploaded: 2025-05-04T16:21:20.000Z
Duration: 6 min 32 s

地球是距離太陽最近的第三顆行星。

轉承詞

You probably already know a lot about the planet earth, because earth is the planet where we live.

你可能已經對地球有了很多瞭解，因為地球是我們生活的星球。

Although it is the largest of the inner planets, or the four rocky planets that orbit nearest the sun, the earth is far, far smaller than the four gas giants that circle the outer edges of the solar system.

雖然地球是內行星中最大的一顆，或者說是離太陽最近的四顆巖質行星，但它比環繞太陽系外圍的四顆氣態巨行星要小得多、小得多。

The earth is also the first planet when traveling out from the sun to have a moon, and the only planet in the solar system to have only one moon.

地球也是從太陽系中第一個擁有衛星的行星，也是太陽系中唯一隻有一個衛星的行星。

The earth is unique among the planets of the solar system, because earth is the only planet that has liquid water on its surface.

地球在太陽系行星中是獨一無二的，因為地球是唯一表面有液態水的行星。

Other planets are either too hot, causing all their water to evaporate into gases, or too cold, causing any water they have to freeze into ice.

其他行星要麼太熱，導致所有的水都蒸發成氣體，要麼太冷，導致所有的水都凍結成冰。

The earth is about 93 million miles, or 150 million kilometers away from the sun, which keeps it at just the right temperature to have liquid water.

地球距離太陽約 9300 萬英里，即 1.5 億公里，這使得地球的溫度恰好適合液態水的存在。

More than 70% of the earth's surface is covered by oceans.

地球表面 70% 以上被海洋覆蓋。

That means that the oceans are more than twice the size of all the land on earth.

這意味著海洋的面積是地球上所有陸地面積的兩倍多。

Because earth has so much water on it, it is sometimes called the blue planet.

因為地球上有大量的水，所以有時被稱為藍色星球。

Liquid water is what allows life to exist on earth.

液態水是地球上生命存在的基礎。

As far as we know, earth is the only place that life exists.

據我們所知，地球是唯一存在生命的地方。

Millions of species of plants and animals call the planet earth home, including humans.

地球上有數百萬種動植物，其中包括人類。

Earth's atmosphere is another important feature.

地球的大氣層是另一個重要特徵。

The atmosphere is a thick layer of gases that covers the entire earth.

大氣層是覆蓋整個地球的一層厚厚的氣體層。

It is mostly made of nitrogen and oxygen.

The atmosphere is what allows us to breathe.

It also helps keep the earth warm by acting like a blanket to hold in the sun's heat.

它還能像毯子一樣吸收太陽的熱量，幫助地球保持溫暖。

Another way the atmosphere helps us is by protecting the earth from harmful radiation from the sun, and also from meteors.

大氣層幫助我們的另一種方式是保護地球免受來自太陽和流星的有害輻射。

Anything falling to the earth from space is rubbed against the gases in the atmosphere until they burn.

從太空落到地球上的任何東西都會與大氣層中的氣體發生摩擦，直至燃燒。

Most things burn up completely before they reach the surface, but even anything that makes it through is much smaller by the time it hits the ground.

大多數東西在到達地面之前就已經完全燃燒殆盡，但即使有東西能夠通過，在到達地面時也已經小了很多。

The time it takes to go around the sun is called a year.

It takes the earth about 365 days to travel around the sun once.

地球繞太陽一週大約需要 365 天。

這就是為什麼一年通常是 365 天。

The time it takes for the earth to rotate once is called a day.

地球自轉一週的時間稱為一天。

The earth rotates every 24 hours, and that is why a day is 24 hours long.

地球每 24 小時自轉一圈，所以一天有 24 小時。

The earth does not rotate straight up and down.

There is an imaginary line through the earth from the north pole to the south pole, called the earth's axis, and this axis is tilted at about 23 degrees.

從北極到南極有一條貫穿地球的假想線，稱為地軸，這條地軸傾斜約 23 度。

Why is it important that the earth is tilted?

Well, the tilt of the earth's axis is what causes the seasons.

地軸傾斜是造成季節變化的原因。

When a part of the earth is tilted towards the sun, it will be summer there.

當地球的一部分向太陽傾斜時，那裡就是夏天。

When it is tilted away from the sun, it will be winter instead.

當它偏離太陽時，就會變成冬天。

The inside of the earth is very different from the outside.

If you were to cut the earth in half, you could see that it is made up of different layers.

如果把地球切成兩半，你就會發現它是由不同的層組成的。

The outermost layer, called the crust, is where we live.

最外層被稱為地殼，是我們生活的地方。

Everything you see trees, mountains, rivers, houses, and even the oceans are sitting on top of the earth's crust.

你所看到的一切樹木、山脈、河流、房屋甚至海洋都位於地殼之上。

The crust is so thick that humans have never been able to dig deep enough to break through it, but the crust is only a thin layer on the surface of the earth.

地殼是如此之厚，以至於人類一直無法挖到足夠深的地方來突破它，但地殼只是地球表面的薄薄一層。

The mantle is a thick layer of molten rock, or magma.

地幔是一層厚厚的熔岩或岩漿。

Sometimes magma from the mantle will come up to the surface through volcanoes.

有時，地幔中的岩漿會通過火山噴出地表。

The core is at the very center of the earth, and it is very, very hot, with a temperature of thousands of degrees.

地核位於地球的最中心，溫度非常非常高，高達數千度。

It is made of metal, mostly iron and nickel, and even though it is very hot, it is under so much pressure that it is solid.

它是由金屬（主要是鐵和鎳）製成的，儘管溫度很高，但由於受到很大的壓力，所以很堅固。

The earth is important to us because it is our home.

地球對我們很重要，因為它是我們的家園。

About 7 billion people live on the earth right now, as well as millions of species of plants and animals.

目前，地球上生活著約 70 億人，以及數百萬種動植物。

So far, we have not found any other planet in the entire universe that would make a good home for us, so it is important that we take care of the planet we have.

迄今為止，我們在整個宇宙中還沒有發現任何其他星球可以作為我們的家園，是以我們必須愛護我們所擁有的這個星球。

I hope you enjoyed learning more about earth today.

希望你們喜歡瞭解更多關於地球的知識。