One of the worst mass bleaching events in history occurred in 1998 — which was also one of the hottest years on record, and like 2010, an El Nio year.

史上最严重的大规模珊瑚白化事件之一发生于1998年——该年也是有史以来最热的一年，与2010年一样，也是厄尔尼诺现象的一年。

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Mass bleaching events were extremely rare 30 years ago but had become increasingly common in recent years, he said.

他说，三十年前，大规模的褪色事件极其罕见，但是近几年已经变得越来越平常。

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This year is the third time in 18 years that the Great Barrier Reef has experienced mass bleaching due to global warming, and the current event is much more extreme than we've measured before.

“由于全球变暖，这已是大堡礁在过去18年来第三次出现大规模的珊瑚白化现象。 目前的状况比我们以前所了解的更为极端”。

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