以下为句子列表：
英文: The larvae of flies parasitize earthworms.
中文: 蝇的幼虫寄生在蚯蚓上。
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英文: The results showed that C. plutellae could parasitize all the four instars of DBM larvae, but prefered 2nd and 3rd instars when the 2nd, 3rd and 4th instars of host larvae were exposed simutaniously to this parasite.
中文: 结果表明，该蜂能寄生小菜蛾各个龄期的幼虫，但当2-4龄幼虫同时存在时，偏爱寄生2、3龄幼虫，对2、3、4龄幼虫的选择系数分别为0.37、0.39、0.24。
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英文: The selection indice of M.tuberculifer on st, nd and rd instar P.separata larvae were 0., 0. and 0.0 respectively, but it didn't parasitize the larvae over rd instar.
中文: 对、、 龄幼虫的选择系数分别为0.、0.、0.0。
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