Many objects in the universe are invisible, but they send radio waves.
宇宙中的许多物体是看不见的，但它们发射无线电波。
Radio waves can be destroyed even though they are invisible in the relevant sense.
无线电波可以毁灭,即使它们是无形的,在相关的意义上来说。
Radio waves can be destroyed even though they are invisible in the relevant sense.
无线电波可以毁灭,即使它们是无形的,在相关的意义上来说。
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