to break down

• 大票换小票

to break down的用法和样例：

例句

1. If you can't pull yourself through the window, you'll have to break down the door.
   如果你无法从窗子钻进去，那么你就只好破门而入了。
2. A very heavy metal bar used by firefighters and law enforcement officers to break down walls and doors.
   破墙槌一种非常沉重的金属槌，是救火人员和执法官员用来捣破墙和门而用的