金属铸孔的英文：
cavity
n. 腔；洞
The hole in the tooth is cavity.
牙上的洞叫做蛀牙。
The peritoneal cavity is a closed sac.
腹膜腔是一个封闭的囊腔。
To insert a pack into a body cavity or wound.
塞裹布把裹布塞入人体体腔或伤口
There's a cavity in the boy's tooth.
这个男孩的牙上有一个洞。
The dentist carefully located the filling in the cavity
牙医小心地把填塞的东西放入牙洞里。