The livestock sector is probably the largest source of water pollution, contributing to eutrophication, 'dead' zones in coastal areas and degradation of coral reefs.

畜牧业很可能是水污染的最大来源，造成富营养化、沿海地区出现“死区”和珊瑚礁退化。

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However, when he returned some years later, the colourful coral reefs were dead and grey.

然而，多年以后，当他回来时，艳丽多彩的珊瑚礁已经死了，变成灰色的了。

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However, when he returned some years later, the colorful coral reefs were dead and grey.

然而，在他多年以后回来时，那些彩色的珊瑚礁全死了并变成了灰色的。

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Coral reefs are reportedly dead.

珊瑚礁据说已经死亡。

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Coral reefs are reportedly dead.

珊瑚礁据说已经死亡。

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