◙ noun 1. a large natural stream of water flowing in a channel to the sea, a lake, or another such stream • 河，江，川；水道 a large quantity of a flowing substance • 巨流；大量 »great rivers of molten lava. 熔岩巨流。 »the trickle of disclosures has grown into a river of revelations. 点点滴滴地透露的情况已经汇成了一股大曝光的巨流。 used in names of animals and plants living in or associated with rivers, e.g. river dolphin, river birch • [用于生长在河里或与河流相关的动物和植物的名称中，如river dolphin, river birch] 河
【IDIOMS】
◘ sell someone down the river 1. [informal] betray someone, especially so as to benefit oneself • [非正式] （尤指为使自己得益而）出卖某人；背叛某人；欺骗某人 ◘ up the river 1. (informal, chiefly N. Amer.)to or in prison • [非正式，主北美] 进监狱，坐牢
【派生】
♦ rivered adjective ♦ riverless adjective
【语源】
1. Middle English: from Anglo-Norman French, based on Latin riparius, from ripa 'bank of a river'