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。
原声例句
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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.
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).