- It took over an hour to drown this full-grown bull.
它得花上一个多小时 才能淹死这只成年公角马 - To surprise their prey
为了突袭猎物 - crocodiles must strike with lightning speed.
鳄鱼必须以闪电般的速度出击 - Here, only the narrowest line separates life from death.
在这里 生与死只有一线之隔 - Most rivers drain into the sea,
大部分河流都汇入大海 - but some end their journey in vast lakes.
可有些河流的终点却是大型湖泊 - Worldwide lakes hold twenty times more fresh water than all the rivers.
全球湖泊淡水储量比江河多20倍