燕子躜天儿。

The swallow dashed [ shot] through the air.

燕子擦着树梢飞过。

The swallow shaved the top of a tree.

燕子在万里无云的蓝天飞翔。

There were swallows in the cloudless blue sky

燕子有筑巢的习性。

Swallows have an aptitude for building nests.

燕子衔泥筑窠。

Swallows carry bits of earth in their bills to build nests.

春天来临时燕子成群飞来。

Swallows come by group at the advent of spring.

燕子自由自在地飞翔。

Swallows fly about, carefree and at liberty.

一只燕子飞过去了。

A swallow flew past.

燕子呢喃。

The swallow twitters.

房檐的下方住着一窝燕子。

There is a swallow's nest under the eaves.

燕子在房檐下做了个窝。

The swallows have built a nest under the eaves.

燕子正在我们的屋檐下筑巢。

The swallows are building a nest under the roof of our house.