短语词组短語Laborsaving valve 省力閥laborsaving laboursaving 節省勞力的laborsaving rearing 省力化養蠶laborsaving silkworm rearing 省力化養蠶technique of laborsaving silkworm rearing 省力化養蠶技術laborsaving technology of silkworm rearing 省力化養蠶技術 返回 laborsaving