一群太平洋斜头鹦哥鱼（steephead parrotfish）正在坎顿岛附近的死亡珊瑚礁上进食。
A school of Pacific steephead parrotfish graze on dead coral at Kanton island.
这里的珊瑚礁是美丽的，但是如果海水被污染，珊瑚就会死亡。
The reefs here are beautiful, but if the sea water is polluted, the coral will die.
我们之前提到了世界各地热带地区中珊瑚礁的衰落，即自然和人为（造成的）压力是怎样造成珊瑚礁退化，或者甚至在某些情况下，造成它们死亡的。
We've been talking about the decline of coral reefs in tropical areas all over the world—how natural and man-made stresses are causing them to degrade or in some cases, to die.
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