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radioelement (radioelementum) | |||
radiation element | |||
activity elements | |||
radioelement An element that is naturally radioactive (具有天然放射性元素的物质。) | |||
radioactive element | |||
radioelement | |||
| |||
radioactive element; radioelement |
放射性 元 素 : 25 phrases in 12 subjects |
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