短語詞組短語Dry Riverbed 干枯河床riverbed stability 河床穩(wěn)定;河床穩(wěn)定性riverbed roughness 床面粗糙度riverbed scouring 河道沖刷sand riverbed 沙質(zhì)河床riverbed scour 河床演變overburden riverbed 覆蓋層narrowed riverbed 束窄河床riverbed placer 河床砂礦 返回 riverbed