上个月的地震导致福岛核电站受损，引发放射性蒸汽和水的泄漏。
The earthquake last month crippled the Fukushima plant, leading to leaks of radioactive steam and water.
辐射来自于外层空间（宇宙射线），以及在土壤，水和空气中的天然放射性物质。
The radiation comes from space (cosmic rays) as well as natural radioactive materials found in the soil, water and air.
日本当局把用于冷却核反应堆的海水又倒入了海中，此外还有从电站裂缝中泄露的被污染的水和空气中的放射性粉尘。
Authorities dumped some of the waste seawater used to cool the reactors back into the sea, where it joined contaminated water leaking from cracks in the plant and nuclear fallout from the air.
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