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At dawn, the first adult midges start to break out.
黎明時分，第一只成蚊破蛹而出
Soon, millions upon millions of newly-hatched lake flies are taking to the wing.
不久，成百上千萬只新羽化的幽蚊全都扇動著翅膀飛到空中
Early explorers told tales of lakes that smoked as if on fire.
早期探險家看到這種湖面上“冒煙”的情景，還以為是湖底著了火
But these spiralling columns, hundreds of metres high, are mating flies.
這些高達數百米的螺旋型“煙”柱，其實是正在交配的幽蚊
0nce the flies have mated, they will all drop to the water surface, release their eggs and die.
幽蚊完成交配之后，便會一起落到水面，產下卵，然后死去
Malawi may look like an inland sea, but it's dwarfed by the world's largest lake.
馬拉維湖看起來像大海一樣遼闊，但它遠比不上世界上最大的湖泊。
Baikal in eastern Siberia.
東西伯利亞的貝加爾湖
Four hundred miles long and over a mile deep,
貝加爾湖長400英里，深度超過1英里，
Baikal contains one-fifth of all the fresh water found in our planet's lakes and rivers.
其中的淡水儲量占到了全球江河湖泊淡水總量的1/5
For five months of the year, it's sealed by an ice sheet over a metre thick.
每年中總有5個月，湖面被1米厚的冰層覆蓋。
