年幼的孩子不明白因果关系，所以他们可能会在摆动的秋千前奔跑。

Young children don't understand cause-and-effect, so they may run in front of moving swings.

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它来回摆动，将将在他下巴前停住。

It flies back and forth, stopping just short of his chin.

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在main中，当从foo返回后，namestr实际上时一个摆动的指针，因为foo已经在返回前释放了那个内存。

In main, after returning from foo , namestr is actually a dangling pointer, because foo has freed that memory before returning.

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