短語(yǔ)詞組短語(yǔ)valley valley floor 谷地valley -floor side strip 谷側(cè)陵削平臺(tái)glacial valley floor step 冰谷階Reaching The Valley Floor 到谷底the valley floor 河谷平原aggraded valley floor [地質(zhì)]加積谷底;堆積谷底Valley Floor Loop 谷底小徑 返回 valley floor