saprozoite

例句：

1. 1.The parasite infects the host and causes disease.
   寄生虫感染宿主并导致疾病。
2. 2.The zygote develops into a complete organism.
   受精卵发育成一个完整的生物体。
3. 3. Parasites can be harmful to their hosts.
   寄生虫对它们宿主有害。