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| natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. (辐射主要归因于铀，其少量出现在一些岩石、土壤，建筑材料等里面。) | |||
| natural radioactivity | |||
| natural activity | |||
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| natural activity; natural radioactivity | |||
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天 然放射性 : 26 phrases in 11 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 4 |
| Geology | 2 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Nuclear physics | 2 |
| Sports | 2 |
| Technology | 10 |
| Wind Energy | 1 |
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