parasites and predators

例句：

1. 1.The parasites and predators are constantly in a state of flux.
   寄生虫和食肉动物一直处于动态变化中。
2. 2. The parasitic behavior of the parasites is a major cause of disease.
   寄生虫的行为是疾病的主要原因。
3. 3.The predators are always on the lookout for their next meal.
   食肉动物总是在寻找下一顿食物。