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Most rivers drain into the sea, but some end their journey in vast lakes.
大部分河流都匯入大海，可有些河流的終點卻是大型湖泊
Worldwide, lakes hold 20 times more fresh water than all the rivers.
全球湖泊淡水儲量比江河多20倍
The East African Rift Valley holds three of the world's largest, Malawi, Tanganyika and Victoria.
東非大裂谷內有著3個世界上最大的淡水湖，馬拉維湖、坦噶尼喀湖以及維多利亞湖。
Lake Malawi, the smallest of the three, is still bigger than Wales.
馬拉維湖是這3個湖泊中最小的，卻仍比威爾士還要大
Its tropical waters teem with more fish species than any other lake.
生活在這個熱帶湖泊里的魚類比其它湖泊都要豐富
There are 850 different cichlids alone,
這里有850多種不同的慈鯛
all of which evolved from just one single ancestor isolated here thousands of years ago.
它們都是從一個數千年前即被隔絕在此的祖先進化而來的
These two-metre wide craters are fish-made.
這些2米寬的土丘是魚兒們的杰作
Fastidiously maintained by the males, these bowers are courtship arenas.
雄魚一絲不茍地維護著坑巢，因為這里正是求愛的場所
Cichlids are caring parents. Brooding young in the mouth is a very effective way of protecting them.
慈鯛是盡心盡職的父母。它們將魚苗含在嘴里，這是一種保護它們的有效方法。
