subsurface barrier
... subsurface anomaly 地下异常 subsurface barrier 地下遮挡；地下不渗透层 subsurface blowout 地下井喷 ...
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它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。
Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.
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