燕的

例句：

1. 1. The swallows are flying south for the winter.
   燕子们正在向南飞去过冬。
2. 2. The swallows have returned to their nests after a long migration.
   燕子们在长途迁徙后回到了它们的巢穴。
3. 3. The swallows are known for their distinctive call.
   燕子以其独特的鸣叫声而闻名。