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覆盖层屏蔽掉了放射性.用英语怎么说？

覆盖层屏蔽掉了放射性.

Overburden had concealed the radioactivity.

相关词汇
overburden had concealed the radioactivity

overburden

vt. 装载过多，负担过多，使过劳；n. 过重的负担；

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

concealed

adj. 隐藏的；v. 隐藏，隐瞒，遮住( conceal的过去式和过去分词 )；

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

radioactivity

n. 放射（性），辐射能；
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