我问一只鸭子它们在做什么，它告诉我它们在练习飞行队形，为冬天去南方做准备。

I asked a duck what they were doing and he told me they drilled to practice their flying formations when they go south for the winter.

youdao

我问一只鸭子它们在做什么，它告诉我它们在练习飞行队形，为冬天去南方做准备。

I asked a duck what they were doing and he told me they drilled to practice their flying formations when they go south for the winter.

youdao