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| background radiation Radiation resulting from natural sources, as opposed to man-made sources, and to which people are exposed in everyday, normal life; for example from rocks and soil (来自于自然界的辐射而非来自于人为来源的辐射，正常情况下人们每日都暴露于此辐射下，例如来自于岩石和土壤。) | |||
| background radiation | |||
| background emission | |||
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背景辐 射 : 19 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Remote sensing | 1 |
| Space | 5 |
| Technology | 10 |
| United States | 1 |
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