如何寻找句子谓语成分

But the radio waves that we use for these purposes microwaves travel in straight lines.

这句话 that 后边是定语修饰 radio wave，然后 microwaves travel in straight lines 是什么成分，以及这句话的谓语是哪呀？

But the radio waves that we use for these purposes microwaves travel in straight lines.

这位无名网友的解答是正确的。

microwaves是主语 the radio waves that we use for these purposes的同位语。

曹荣禄 -

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