A bird is flying over the sky

一只小鸟───A Bird ;从天上───From the sky

At one point a bird trilled in the conservatory.───在某一刻，一只鸟儿在温室里唧啾啼叫。

There was a bird perched on the roof.───有一只鸟落在屋顶上。

A bird had pecked a hole in the sack.───一只鸟把袋子啄了个洞。

Had the French inventor tried to model his plane on every detail of a bird's wing, he would not have succeeded in flying it.───要是那个法国发明家力图模仿鸟翼的每个细节来造他的飞机的话，他就不会使它飞起来。（虚拟条件）

(of a bird or other animal) move by jumping with two or all feet at once.───（鸟或别的动物）齐足跳，跳跃

Every time I saw them, I would get a strong feeling that I would like to be a bird, flying together with them.───每当看到它们，也会想变成一只鸟，同它们一起飞翔。

A bird had pecked a hole in the sack.

A bird has just flown by.

Tammy eats like a bird.

A bird in the hand is worth two in the bush. 

A bird may be known by its song.