比你想象的更频繁地发生
最近,澳大利亚因为丢失了一个放射性胶囊而陷入了混乱。
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(English) A small capsule, containing the radioactive element caesium-137, was recently discovered in Western Australia’s pine forests. Though it is small, its power is mighty, and experts warn that contact with it could cause serious harm. Learn more about caesium-137 and how to stay safe.
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