n.山谷( valley的名词复数 )；流域；溪谷； 双语释义：n.(名词)[C] 谷,山谷 an area of land lying between two lines of hills or mountains, often with a river running through it[C] 流域 a region drained by a river英英释义： valleyn.a long depression in the surface of the land that usually co