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The white cliffs of Dover, for example, are white because they contain limestone, or calcium carbonate.
比如，多佛的白色峭壁之所以为白色就是因为含有石灰岩或碳酸钙。
Most water contains some carbon dioxide making it a weak acid that can eat away at the calcium carbonate in limestone.
大多数水含有一些二氧化碳，使得水显弱酸性，能够侵蚀石灰岩中的碳酸钙。
Most water contains some carbon dioxide, making it a weak acid that can eat away at the calcium carbonate in limestone.
大多数水含有一些二氧化碳，使得水显弱酸性，能够侵蚀石灰岩中的碳酸钙。
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