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A coral reef during the day is a very different place from a coral reef at night.
珊瑚礁的白天与夜晚是两个完全不同的世界。
The atmosphere changes completely.
这里的气氛完全不同。
The day shift has logged off, and the night shift has gone to work.
白天活跃的动物休息了，夜晚活动的方才出动。
It's mean and moody, and the animals here mean business.
夜晚环境恶劣多变，动物们必须保持警惕。
Just as in human cities, there's a new cast of characters after dark.
就像人类城市一样，夜幕下出动的都是迥然不同的角色。
Octopus emerge from their holes to stalk their prey.
章鱼从藏身的洞穴里出来觅食。
A tiny sole improves his chances of survival by mimicking a toxic flatworm.
这条小鰨鱼为了增加生存机会在模仿有毒的扁虫。
Some of the strangest nocturnal creatures are relatives of the starfish, like this feather-mouthed sea cucumber, sifting food from the sand.
一些最奇特的夜间生物都是海星的表亲，比如这一有着羽毛状口部的海参在用口从沙中筛出食物。
Another is the basket star.
还有这个筐蛇尾。
It comes alive at night, throwing out thousands of arms to filter food from the plankton-rich current.
它夜间出来，伸展开上千个枝杈般的触手从富含浮游生物的水流中过滤食物。
These animals can live for a very long time, up to 35 years.
它们的寿命很长，可达35岁。
And there's records of these guys being seen night after night,in the same place for over 15 years.
有记录证明这几个昼伏夜出的家伙在同一地点被观察记录了15年之多。
