例如，我们四周到处都是无线电波，但如果没有无线电接收器，我们就不能探测到或感觉到它的存在。

For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver.

youdao

例如，我们四周到处都是无线电波，但如果没有无线电接收器，我们就不能探测到或感觉到它的存在。

For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver.

youdao