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由于气候变化导致海水温度升高，澳大利亚大堡礁在五年内发生第三次大规模白化现象。大堡礁四分之一的区域出现了严重白化。气候变化仍是珊瑚礁面临的最大挑战。 A man snorkels in an area called the "Coral Gardens" near Lady Elliot Island, on the Great Barrier Reef, northeast of Bundaberg town in Queensland, Australia, June 11, 2017. [Photo/Agencies] The government’s top Great Barrier Reef scientist says a third mass bleaching event in five years is a clear signal the marine wonder is “calling for urgent help” on climate change. 澳大利亚政府大堡礁研究的权威科学家表示，五年内大堡礁发生第三次大规模白化现象，这是大堡礁这一海洋奇迹“呼吁紧急援助”应对气候变化的明确信号。 bleach [bliːtʃ]：v.漂白，晒白 One quarter of the Great Barrier Reef suffered severe bleaching this summer in the most widespread outbreak ever witnessed, according to analysis of aerial surveys of more than 1,000 individual reefs released on Tuesday. 根据本周二Dr David Wachenfeld, chief scientist at the Great Barrier Reef Marine Park Authority, told Guardian Australia: “My greatest fear is that people will lose hope for the reef. Without hope there’s no action. 大堡礁海洋公园管理局首席科学家大卫·瓦肯菲尔德博士告诉《卫报》澳大利亚版说：“我最担心的是人们会对大堡礁失去希望。没有希望就没有行动。” | 
