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.
再次辐射的热量是不同的波长，不能透过玻璃辐射出去。
Re-radiated heat has a different wavelength and cannot pass back out through the glass as easily.
再次辐射的热量是不同的波长，不能透过玻璃辐射出去。
Re-radiated heat has a different wavelength and cannot pass back out through the glass as easily.
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