放射性现象
放射性现象-
就放射性现象来说，你如果给我一个铀原子，我可以告诉你它最终会衰变。
With radioactivity , if you give me a single atom of uranium , I can tell you it will eventually decay .
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因为自然界很多物质具有放射性，辐射现象始终伴随我们身边。
Although we are familiar with radioactivity and it 's around us all the time and always has been because they are a naturally radioactive materials .