gullyn.小峡谷;排水沟v.在…上开沟;形成冲沟=gulley.
gully control dam谷坊
gully development冲沟分布
gully head forward沟头前伸
gully head erosion沟头侵蚀,沟头冲蚀
gully erosion form沟蚀形态
gully bank extension沟岸扩展
gully head protectio沟头防护
gully bed downcutting沟床下切
gully head protection沟头防护
gully and hill region丘陵沟壑区