They can run very fast, so they can protect themselves from dangerous animals such as lions.
它们可以跑得很快，所以能保护自己免受像狮子这样的危险动物的伤害。
They can stay alive because they run fast to avoid lions and other enemies.
它们能活下来是因为它们跑得快，能够避开狮子和其他敌人。
Most people freak out and run up the hill as fast as they can. Then they're pretty much done.
绝大多数人出发和跑上山的时候都尽力跑，他们这样就锻炼过头了。
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