周期: period; cycle; circle; revol ...谷底: valley bottom; valley floor谷底: valley bottom; valley floor◇谷底滩地 strath; 谷底肿胀 bulging in valley (冻土区)晚成年期谷: late mature valley早成年期谷: early mature valley古谷底: former valley bottom; strath谷底线: thalweg; valley line双谷底: double bottom型谷底: w-type bottom爱的谷底: underneath泛滥平原；谷底: valley plain谷底沉积: valley flat sediment谷底堆积: valley-floor increment谷底分水界: valley-floor divide谷底基盘: valley floor basement谷底基岩面: valley-floor basement谷底阶地: bed terrace谷底捞鱼: bottom fishing谷底平地: valley flat谷底平原: valley floor plain; valley-floor plain谷底水平原: valley flat谷底滩地: strath谷底土壤: valley soil谷底小平原: valley flat谷底肿胀: bulging in valley
