318　rock和stone

1　rock 指天然的大岩石，在美式英语中也指小石块。

A huge rock blocks the way. 一块巨石挡住了路。

Rocks are rolling down the side of a mountain. 巨石从山腰滚下来。

2　stone 指较小的石块或加工过的建筑用石。

The school had a stone wall around it. 这所学校周围有石墙。

The boys threw stones/rocks in the pond. 孩子们把石块扔进池塘。