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可数。river只能用作名词，意思是“河；江；河流；水道”，复数形式是rivers。当river专有名词时，其前面必须要冠词，比如the River Amazon（亚马逊河）。
river的例句
Here the river takes an abrupt bend to the west.
这条河在这里急转向西流去。
The river rises from a spring.
这条河发源于一处泉水。
The river roared him to sleep.
河流的奔腾声使他入睡了。
The river is rising after the rain.
河水在雨后涨了起来。
The guide led us to the river.
向导带领我们到河边。
Growing along the river are tall palm trees.
沿着这条河生长的是高大的棕树。
Navigation is difficult on this river because of the hidden rocks.
因为河上有暗礁，所以在这条河上航行很困难。