收集一些石头，告诉他们有些是矿石，有些可以作装饰用，像用来建造房子的大理石—样，还有一些可以用来铺路。
Collect some rocks and point out that some rocks are minerals, others may be used for decorations, like marbles used in building houses, and still other rocks are used to build roads.
收集一些石头，告诉他们有些是矿石\有些叫以作装饰用，像用来建造房子的大理石—样，还有一些可以用来铺路。
Collect some rocks and point out that some rocks are minerals, others may be used for decorations, like marbles used in building houses, and still other rocks are used to build roads.
收集一些石头，告诉他们有些是矿石\有些叫以作装饰用，像用来建造房子的大理石—样，还有一些可以用来铺路。
Collect some rocks and point out that some rocks are minerals, others may be used for decorations, like marbles used in building houses, and still other rocks are used to build roads.
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