large stone bit

例句：

1. 1. The builders were busy chipping away at the large stone to make way for the new road.
   建筑工人正在忙着砍掉大石头，为新路腾出空间。
2. 2.The old house was surrounded by large stones that had been there for centuries.
   这座老房子周围是一些年代久远的大石头。
3. 3.He found a large stone in the garden and decided to use it as a stepping stone.
   他在花园里发现了一块大石头，决定把它当作一个踏脚石。