limestone造句

Limestone is often used in building construction.
石灰岩常用于建筑.

Cement is made from limestone.
水泥是由石灰石制成的.

The limestone is sufficiently fissured for tree roots to have breached the roof of the cave.
石灰岩上有许多缝隙，故而树根能从岩洞顶部长出来。

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