jutter

例句：

1. 1.The bird is building its nest in the tree.
   那只鸟正在树上筑巢。
2. 2.The baby bird is sleeping in its egg.
   小鸟儿正睡在它的蛋里。
3. 3.The mother bird is watching over her young one.
   母鸟正在照顾她的小宝宝。