短語詞組短語fault trough submarine valley 斷槽海底谷;斷層槽海底谷trough shaped valley 槽形谷shoulder of trough valley 槽谷肩trough -shaped submarine valley 槽形海底谷trough valley then 槽谷karst trough valley then 巖溶槽谷karst trough valley 巖溶槽谷ancient valley trough 古溝槽 返回 trough valley