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太陽系中的所有行星都有一定程度的大氣層。大氣層是一層環繞世界的氣體。

All the planets in the solar system have an atmosphere to some extent. An atmosphere is a layer of gas sourrounding a world.

 一般來說，它是一個非常薄的層。

In general, it is an extremely thin layer.

就地球而言，相比之下，大氣中大約三分之二的空氣位於地球​​表面10公里範圍內。

In the case of the Earth, In contrast , approximately two-thirds of the air in the atmosphere lies within 10 kilometers of Earth's surface.

換句話說，如果在標準地球儀上展示，這種空氣的厚度僅為一美元。

In other words, this air is only as thick as a dollar bill...

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太陽系中的所有行星都有一定程度的大氣層。大氣層是一層環繞世界的氣體。

All the planets in the solar system have an atmosphere to some extent. An atmosphere is a layer of gas sourrounding a world.

 一般來說，它是一個非常薄的層。

In general, it is an extremely thin layer.

就地球而言，相比之下，大氣中大約三分之二的空氣位於地球​​表面10公里範圍內。

In the case of the Earth, In contrast , approximately two-thirds of the air in the atmosphere lies within 10 kilometers of Earth's surface.

換句話說，如果在標準地球儀上展示，這種空氣的厚度僅為一美元。

In other words, this air is only as thick as a dollar bill if represented on a standard globe.  

構成任何大氣的空氣是由幾種原子或分子組成的幾種氣體的混合物。

The air that makes up any atmosphere is a mixture of several types of gases that consists either of individual atoms or of molecules.

 在大多數情況下，大氣中的溫度足夠低，原子可以結合成分子。

In most cases, temperature in the atmospheres are low enough for atoms to combine into molecules. 

例如，我們呼吸的空氣由分子氮和氧氣組成，而不是單個原子。

The air we breathe, for instance, consists of molecular nitrogen and oxygen as opposed to individual atoms.