筑巢

The nesting instinct is proper to birds.

筑类的本能。

The swallows are nesting in the woodshed.

燕子正在小棚里筑呢。

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

燕子正在我们的屋檐下筑。

Some birds build nests of twigs.

一些用枝筑。

Summer migrants nest here.

夏天候来这里筑。