但很奇怪的是，人类希望能通过研究鸣禽类得到一些线索。

But, oddly enough, people who study birds think they may have some clues.

youdao

但很奇怪的是，人类希望能通过研究鸣禽类得到一些线索。

But, oddly enough, people who study birds think they may have some clues.

youdao