一个鸟类观察者用他的大望远镜观察他的一举一动，没人知道为什么。

A birdwatcher kept an eye on his activities with his large binoculars.Nobody really knows why.

youdao

一个鸟类观察者用他的大望远镜观察他的一举一动，没人知道为什么。

A birdwatcher kept an eye on his activities with his large binoculars.Nobody really knows why.

youdao