exosphere [ˈeksoʊsfɪr]

例句:

• Last is the exosphere, which is outermost layer of the atmosphere.
  最后是散逸层, 这是大气的最外层.
  
• This region is called exosphere.
  这层大气称为外逸层.
  
• Above the troposphere is the stratosphere, followed by the ionosphere and capped by the exosphere.
  在对流层上是平流层, 接着是电离层,最上层是外逸层.
  
• About the only primer we have for understanding Mercury's exosphere, said Sarantos, will be the moon's.
  来自MSN