lime·stone /ˈlaɪmˌston/
石灰石
Lime·stone n. A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.
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limestone
n : a sedimentary rock consisting mainly of calcium that was
deposited by the remains of marine animals