窟窿；山洞；兽穴hole; cave; animal den

• 蛀牙洞

  cavity

• 树洞

  hollow in a tree

• 老鼠洞

  mouse hole

• 老虎洞

  tiger den

• 桥洞

  aperture

• 破了个洞

  poke a hole

• 打一个洞

  punch a hole

• 把洞堵住

  plug up a hole

• 轮船穿了个洞。

  A hole was ripped in the boat.

零zero; used when reading the numeral '0' out loud

<书>参见：洞穿

• 弹洞其腹。

  The bullet ripped through his abdomen.

深远；透彻profound; thorough