parasitic mode of life

例句：

1. 1. Parasites cancause serious health problems in their hosts.
   寄生虫可以在宿主体内引起严重的健康问题。
2. 2. Theparasite is causing the host to suffer fromsevere pain.
   这种寄生虫正在使宿主遭受剧烈的疼痛。
3. 3. Parasites are oftenfound on plants and animals that have losttheir ability to defend themselves.
   寄生虫通常存在于那些已经失去了自我保护能力的植物和动物身上。