鸟巢

例句：

1. 1. The bird is building its nest in the tree.
   那只鸟正在树上筑巢。
2. 2. She built a nest for her baby chicks.
   她为她的小鸡们建了一个巢。
3. 3. The owl was perched on a high branch, watching for prey.
   猫头鹰停在高高的树枝上，观察猎物。