/ˈrɪvə(r) ||; ˈrɪvɚ/noun [C] a large, natural flow of water that goes across land and into the sea 河；河流:
the River Nile 尼罗河He sat down on the bank of the river to fish. 他在河岸边坐下来钓鱼。 A river flows into the sea. Where it joins the sea is the river mouth. A boat sails on the river. We walk, sail, etc up or down river. 河水流入(flow into)大海。与海会合的河口叫做river mouth。船在河上航行(sail on the river)，逆流而上或顺流而下可以说up／down the river。