筑巢

1.The swallows are nesting in the woodshed.

燕子正在小棚筑巢呢。

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

燕子正在我们的屋檐下筑巢。

3.The nesting instinct is proper to birds.

筑巢的本能。

4.Some birds build nests of twigs.

一些用枝筑巢。

5.Summer migrants nest here.

夏天候筑巢。