At each stage of development the trematode encounters formidable hazards . 吸虫在发育的每一个阶段，都可能遭遇到极大的风险。
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Medicine domestic animal liver piece trematode 1 intermediate 医药牲畜肝片吸虫1号的中间体。
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Through the bird ' s feces , trematode eggs enter the water 寄生虫在鸟类体内成熟、繁殖， ?们的卵再经由鸟粪进入水中。
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Although parasitism by trematodes is the likeliest explanation for most outbreaks of amphibian deformities , it is certainly not the only cause and may often be abetted by additional factors 受到吸虫寄生虽是多数两生类畸形的最可能解释，但绝不是唯一的原因，往往也可能受到其他因子连带影响。
