bed groynesubmerged groin河底: river bottom潜堤: submerged breakwater河底潜坝: low-level groin; low-level groyne河底潜丁坝: low level groin河底潜流: stream underflow下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:河底潜堤，即可在微信中查询翻译
