and

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and, despite the harsh conditions, life flourishes here in isolation.
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and, despite the harsh conditions, life flourishes here in isolation. 尽管生存条件恶劣 生命仍在这个与世隔绝的地方得到了兴盛

release their eggs and die.
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release their eggs and die. 产下卵 然后死去

and undergo a magical transformation.
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and undergo a magical transformation. 然后经历一场不可思议的变化

Malawi, Tanganyika, and Victoria.
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Malawi, Tanganyika, and Victoria. 马拉维湖、坦噶尼喀湖 以及维多利亚湖

and gather in anticipation.
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and gather in anticipation. 不出所料 它们纷纷下水

rivers slow down and lose their destructive power.
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rivers slow down and lose their destructive power. 河水流速变慢 没有了原来的破坏力

and even bigger predators.
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and even bigger predators. 甚至更大的掠食动物

Only the adults have the speed and agility needed to make a catch.
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Only the adults have the speed and agility needed to make a catch. 只有成年水獭才具备 捕鱼所需的速度和灵巧

they gradually warm and begin to support more life.
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they gradually warm and begin to support more life. 河水渐渐变暖 养育的动物也多了起来

and at its widest it's 17 miles across.
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and at its widest it's 17 miles across. 最宽的地方达17英里