They are the key scavengers in this lake. 它们是湖里不可或缺的“清洁工”
Baikal seems more like an ocean than a lake. 贝加尔湖看起来 更像是海洋 而不是湖泊
Baikal is the oldest lake in the world 贝加尔湖是世界上最古老的湖泊
but it's dwarfed by the world's largest lake - 但它远比不上世界上最大的湖泊
Soon, millions upon millions of newly hatched lake flies are taking to the wing. 不久 成百上千万只新羽化的幽蚊 全都扇动着翅膀飞到空中
Here, in this dead zone the larvae of lake fly midges hide out away from predators. 这个死亡地带成了 幽蚊幼虫躲避天敌的庇护所
The floor of Lake Malawi drops 700 metres into an abyss. 马拉维湖底是一个深达700多米的深渊
This lake can be a dangerous place. 马拉维湖也是个危机四伏的地方
Its tropical waters teem with more fish species than any other lake. 生活在这个热带湖泊里的鱼类 比其它湖泊都要丰富
Lake Malawi, the smallest of the three, 马拉维湖是这3个湖泊中最小的