当能量以辐射能形式存在时，可以在经过很长距离后，才被吸收或转化为热。
While in the form of radiation, the energy may travel a tremendous distance before being absorbed or changed back into heat.
当能量以辐射能形式存在时，可以在经过很长距离后，才被吸收或转化为热。
While in the form of radiation, the energy may travel a tremendous distance before being absorbed or changed back into heat.
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