在高棉王朝时代，它统治了整个湄公河流域，但在5世纪之后，在它的强大邻邦的影响下衰落了。

During the time of the Khmer emperors, it ruled the entire Mekong River valley but fell under the sway of its stronger neighbors after the 5th century.

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在高棉王朝时代，它统治了整个湄公河流域，但在15世纪之后，在它的强大邻邦的影响下衰落了。

During the time of the Khmer emperors, it ruled the entire Mekong River valley but fell under the sway of its stronger neighbors after the 15th century.

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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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