cavity

The dentist had to drill and fill a small cavity in one of my back molars.

(Chinese) 牙医不得不钻开并填充我后面一颗磨牙上的小龋洞。

Brushing your teeth twice a day helps prevent the formation of a cavity.

(Chinese) 每天刷两次牙有助于防止龋洞的形成。

The heart and lungs are located within the protective chest cavity.

(Chinese) 心脏和肺部位于具有保护作用的胸腔内。

The archaeologists discovered a hidden cavity behind the wall of the ancient tomb.

(Chinese) 考古学家在古墓的墙后发现了一个隐藏的空腔。