一些物种已经进化到几乎没有天敌。

Some species have evolved to have very few natural ___predators.

对于没有经验的徒步者来说，森林中的捕食者可能只在攻击时才会被注意到。

For inexperienced hikers, forest ___predators might only be noticed during an attack.

猎豹是一种快速的捕食者，依靠速度捕捉猎物。

The cheetah is a fast ___predator that relies on speed to catch its prey.