Appleton layer

英 美
  • 阿普顿层
  • Appleton 阿普尔顿
  • layer n.层vi.分层vt.将某物堆积成层
Noun:
  1. the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission

【邻近词汇】