nesting

例句：

1. 1. The bird is nesting in the tree.
   这只鸟正在树上筑巢。
2. 2.She nestled her baby close to her chest.
   她把婴儿紧紧抱在怀里。
3. 3.The squirrel was nestling in the hole.
   松鼠正躲在洞里。