用作不及物动词
▲S+～(+A)
Rats had burrowed into the bank of the river.老鼠在河岸上打洞。
They were burrowing for a book in the library.他们在图书馆搜寻一本书。
用作及物动词
▲S+～+n./pron.
They burrowed a hole under a tree.他们在一棵树下挖了一个洞。

The rabbits hid in the burrows.兔子躲在地洞中。