对于远古人类，保持身体足够健康来追赶猎物和躲避食肉动物及敌人对生存来说是十分重要的。
For ancient humans, remaining fit enough to run after game and away from predators and enemies was vital for survival.
它们能长到4米长（12英尺），250公斤重（550磅），当追赶猎物时——大多数时候是沙丁鱼，它们的速度能达到时速70公里（45迈）。
They grow up to four metres (12 feet) in length, weigh as much as 250kg (550lb) and, when chasing prey—mostly sardines—can swim at a speed of 70kph (45mph).
它们能长到4米长（12英尺），250公斤重（550磅），当追赶猎物时——大多数时候是沙丁鱼，它们的速度能达到时速70公里（45迈）。
They grow up to four metres (12 feet) in length, weigh as much as 250kg (550lb) and, when chasing prey—mostly sardines—can swim at a speed of 70kph (45mph).
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