hollow drill

例句：

1. 1. The tree was hollow and could easily be cut down.
   这棵树是空心的，很容易砍倒。
2. 2.The house was hollow, and I felt uneasy inside.
   这所房子是空的，我在里面感到不安。
3. 3. The hole in the wall was hollow, and it seemed to lead to another room.
   墙上的那个洞是空的，它似乎通向另一个房间。