词典释义：
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
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great rivers of molten lava 熔岩巨流
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figurative 〈喻〉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.
［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。
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sell someone down the river 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 -
［ORIGIN earlier referring to the sale of a troublesome slave to the owner of a sugar-cane plantation on the lower Mississippi, where conditions were relatively harsher．］
up the river informal, chiefly N .Amer . to or in prison 〈非正式，主北美〉 进监狱，坐牢 -
［ORIGIN with allusion to Sing Sing prison, situated up the Hudson River from the city of New York．］
"Middle English： from Anglo-Norman French, based on Latin
