| 单词 | ionosphere |
| 释义 | Word Frequency ionosphere(aɪˈɒnəˌsfɪə) noun a region of the earth's atmosphere, extending from about 60 kilometres to 1000 km above the earth's surface, in which there is a high concentration of free electrons formed as a result of ionizing radiation entering the atmosphere from space See also D region, E region, F region Derived forms ionospheric (aɪˌɒnəˈsfɛrɪk) adjective |
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