从进化的角度来说，狗汪汪叫肯定是有理由的，要不这叫声肯定在漫长的进化过程中给淘汰掉了。

In terms of evolution, there has to be a reason for barking, or it probably wouldn't be there.

youdao

从进化的角度来说，狗汪汪叫肯定是有理由的，要不这叫声肯定在漫长的进化过程中给淘汰掉了。

In terms of evolution, there has to be a reason for barking, or it probably wouldn't be there.

youdao