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1. The boat was tied up alongside a crumbling limestone jetty.

这条船停泊在一个摇摇欲坠的石灰岩码头边.

2. Limestone is often used in building construction.

石灰岩常用于建筑.

3. Cement is made from limestone.

水泥是由石灰石制成的.

4. 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。

5. Between the white limestone and the greyish pink limestone is a thin bed of clay.

在白色石灰石和粉灰色石灰石之间是一层薄薄的黏土。