英语翻译In most localities a given species of clam or coral persists essentially unchanged throughout a thick formation of rock,only to be replaced suddenly by a new and different species.

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英语翻译
In most localities a given species of clam or coral persists essentially unchanged throughout a thick formation of rock,only to be replaced suddenly by a new and different species.

在大多数地点,特定的贝类和珊瑚类 通过厚厚的岩层形成 保持不变,最终却突然被一种新的不同物种所替代.