短语词组短语Laborsaving valve 省力阀laborsaving laboursaving 节省劳力的laborsaving rearing 省力化养蚕laborsaving silkworm rearing 省力化养蚕technique of laborsaving silkworm rearing 省力化养蚕技术laborsaving technology of silkworm rearing 省力化养蚕技术 返回 laborsaving