They use these devices — - it's called a wrecker ball — they use them to demolish buildings.

它们用这个设备-，这个叫做清障球-，它们用这个来拆房。

youdao

They use these devices — - it's called a wrecker ball — they use them to demolish buildings.

它们用这个设备-，这个叫做清障球-，它们用这个来拆房。

youdao