Europa, Ganymede, and Callisto all provide evidence of a thin atmospheric layer known as a 'surface-bound exosphere'.
木卫二、木卫三、木卫四都被证实了有一层很薄的大气层。
Atmospheric layer
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That's the second atmospheric layer of Earth that rises anywhere from 6 to 12 miles above the Earth's surface, depending on where you are on the equator.
这是地球表面上升到地球表面的6到12英里之间的第二大气层，具体到地面距离多少取决于你是否位于赤道上。
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Atmosphere of Earth
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).
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