periodical parasitism

• 阶段寄生；周期性寄生

periodical parasitism的用法和样例：

例句

1. Many biologists think that sex, for example, is a response to parasitism.
   许多生物学家认为性就是对寄生病菌的一种反应。
2. Constant parasitism is in trichomonadFemaleInside genital, call vaginal trichomonad.
   滴虫常寄生在女性生殖器内，称为阴道滴虫。