cavity [ˈkævəti]

以下由轻松背单词网站提供

n.洞，穴，凹处，龋洞

a hole , or an empty space between two surfaces

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。