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辐射线不能透过的物质叫不透明体。
Materials through which no radiation is propagated are called opaque.
youdao
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射线能透过太阳光线所不能透过的一些东西。
The X-rays penetrate things which the rays of the sun cannot.
youdao
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射线能透过太阳光线所不能透过的一些东西。
The X-rays penetrate things which the rays of the sun cannot.
youdao