They suggest that any alien civilisation worth its salt would alight not on the photons of the electromagnetic spectrum-whether optical or radio-frequency-to send messages to other solar systems.
他们指出，任何有头脑的外星文明都不会发射电磁波谱中的光子——无论是可见光波段还是射频波段——向另一个太阳系传送信息。
He has had three jobs in the past year, and all his employers have said the same thing-he's lazy, he refused to learn, and he is not worth his salt at all.
他去年有三分工作，但是他的所有老板都一致认为——他懒散，不愿意学习，实在没有一点雇用价值。
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