exosphere

n. 外大气圈

发音

UK

词形变化

exospheres 复数 exospheres

释义与例句

n.
  1. 1.

    the uppermost layer of a planet's atmosphere

    散逸层

    外气层

  2. 2.

    an extremely thin atmosphere, as on Saturn's moon Dione

    "Scientists weren't even sure Dione would be big enough to hang on to an exosphere" ('Cassini Detects Hint of Fresh Air at Dione', , JPL, Mar. 02, 2012)

词汇关系

名词

上位词 1

layer

整体词 1

atmosphere

词源

From exo- + -sphere.

来源：wiktionary