短语词组短語plant mulching 植物覆蓋mulching film 地膜覆蓋;育秧薄膜mulching treatment 覆蓋処理;揭膜処理;覆蓋還田mulching measures 覆蓋措施;覆蓋mulching materials 覆蓋材料surface mulching 表麪覆蓋;覆蓋;地表覆蓋Mulching model 覆蓋模式;種植模式Mulching plastic 地膜ring mulching 環狀覆蓋 返回 mulching