基本解釋[經(jīng)濟(jì)學(xué)]槽形谷詞組短語(yǔ)短語(yǔ)trough -shaped submarine valley 槽形海底谷trough shaped valley更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)槽形谷