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limestone

/ˈlaɪmˌstoʊn/

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1 · noun

a rock made mainly from calcium carbonate

石灰岩

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Rainwater slowly carved a cave through the limestone hillside.
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雨水缓慢侵蚀石灰岩山坡，形成了洞穴。
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Pronunciation: /ˈlaɪmˌstoʊn/

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