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单词 exosphere
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ex•o•sphere  (eksō sfēr′),USA pronunciation n. 
  1. Aerospacethe highest region of the atmosphere, where the air density is so low that a fast-moving air molecule is more than 50 percent likely to escape from the atmosphere instead of hitting other molecules.
  • 1950–55; exo- + -sphere
ex•o•spher•i•cal  (ek′sə sferi kəl, -sfēr-),USA pronunciation ex′o•spheric, adj. 
Collins Concise English Dictionary © HarperCollins Publishers::
exosphere /ˈɛksəʊˌsfɪə/ n
  1. the outermost layer of the earth's atmosphere. It extends from about 400 km above the earth's surface
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