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earthworms (primarily lumbricus terrestris, lumbricus spp, aporrectodea caliginosa, a. rosea and allolobophora chlorrotic) were collected from all field sites, starved for 24 h to clear gut contents, and then analyzed for the presence of the target substances.
从所有农田场地采集了蚯蚓样本（主要有 lumbricus terrestris、lumbricus spp aporrectodea caliginosa、a. rosea 和 allolobophora chlorrotic），让它们饿上 24 小时以清除其消化道的内存物，然后化验分析其体内目标物质的含量。