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| ionosphere | |||
| ionosphere A region of the earth's atmosphere, extending from about 60 to 1000 kilometers 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 | |||
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ionosphere : 27 短语, 5 学科 |
| 信息技术 | 1 |
| 生命科学 | 10 |
| 电子产品 | 11 |
| 自然科学 | 3 |
| 通讯 | 2 |