燕子是一种迁徙鸟类。

The swallow is a migratory bird.

燕子在春天飞回来了。

The swallow has returned in the spring.

燕子在空中飞翔，捕捉昆虫。

The swallow flies in the sky, catching insects.

我看到一只燕子在屋檐下筑巢。

I saw a swallow building a nest under the eaves.

许多人喜欢观察燕子的飞行模式。

Many people enjoy observing the flight patterns of the swallow.

蝙蝠、燕子和更多的动物被密封在水中碳酸钠的沉积物中。

Bats, swallows and more are sealed in the deposits of sodium carbonate in the water.

蝙蝠、燕子和更多的动物以它们死亡时的姿势被化学方式保存下来。

Bats, swallows and more are chemically preserved in the pose in which they perished.

那只燕子飕地飞掠而过。

The swallow whirred past.

然后变身成一只燕子。

And reincarnate into a swallow.

看！那些燕子好自由！

Look! Those swallow are so free!