短語(yǔ)詞組短語(yǔ)rill gully soil erosion 溯源侵蝕gully head erosion 溝頭侵蝕protection of gully head erosion 溝頭防護(hù)hillslope -gully slope erosion system 坡溝系統(tǒng)hill slope -gully side erosion system 坡麪harm of gully erosion 侵蝕危害gully and valley erosion 溝穀侵蝕gully erosion development process 溝蝕縯變collapse gully erosion 崩崗侵蝕 返回 gully erosion