Last is the exosphere, which is the outermost layer of the atmosphere.
最后是散逸层，这是大气的最外层。
The exosphere is the furthest out and the least studied part of the upper atmosphere.
外逸层是最远的，也是研究最少的大气的上层部分。
The exosphere is the furthest out and the least studied part of the upper atmosphere.
外逸层是最远的，也是研究最少的大气的上层部分。
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