| 单词 | Appleton layer |
| 释义 | Appleton layer (once / 11819311 pages) n WORD FAMILY Appleton layer n 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 Syn|Exp F layer, F region part, region the extended spatial location of something |
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