n.石灰岩，石灰石
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 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.
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