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。

youdao

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。

youdao

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。

youdao

Half our coral reefs are dead or dying. We've lost 90 percent of deep blue water,big game fish: the halibut,the tuna and the marlin that we all loved to eat.

VOA: standard.2010.08.04

Some estimates have suggested 20 percent of the world's coral reefs are already dead and an additional 24 percent are gravely threatened.

CNN: Report: Coral almost as genetically complex as humans