Chromium is known as a widely distributed element in the crust and most important environmental pollutant.

铬是一种广泛分布于地壳中的元素，同时也是一种重要的环境污染元素。

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Chromium is known as a widely distributed element in the crust and most important environmental pollutant.

铬是一种广泛分布于地壳中的元素，同时也是一种重要的环境污染元素。

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