parasitics

例句：

1. 1. Parasites can cause serious health problems in humans.
   寄生虫可以在人类中引起严重的健康问题。
2. 2. The disease is caused by a parasite that feeds on the blood of its hosts.
   这种疾病是由一种寄生虫引起的，这种寄生虫以宿主的血液为食。
3. 3.Parasitic plants are able to survive and grow in harsh environments because they have evolved to exploit the resources of their hosts.
   寄生植物能够适应恶劣的环境，因为它们已经进化出了利用宿主资源的能力。