nesting of blocks

例句：

1. 1. The bird is nesting in thetree.
   这只鸟正在树上筑巢。
2. 2. Shebuilt a nest for her baby chicks.
   她为她的小鸡们建了一个巢。
3. 3. The owl was nesting inthe tree, watching over the village.
   这只猫头鹰正在树上筑巢，守护着村庄。