短語詞組短語fault trough submarine valley 斷槽海底穀;斷層槽海底穀trough shaped valley 槽形穀shoulder of trough valley 槽穀肩trough -shaped submarine valley 槽形海底穀trough valley then 槽穀karst trough valley then 巖溶槽穀karst trough valley 巖溶槽穀ancient valley trough 古溝槽 返回 trough valley