ADV [ADVERB after verb] [be ADVERB] 向河口;朝下游方向;顺流而下 Something that is moving down-river is moving towards the mouth of a river, from a point further up the river. Something that is down-river is towards the mouth of a river. 向河口;朝下游方向;顺流而下
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By 09.30 we had cast off and were heading down-river.
9点30分时我们就解缆向下游出发了。
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...a big tourist hotel a few hundred yards down-river.
下游几百码处的一家大型旅游酒店
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Cologne is not so very far down-river from Mainz. [+ from]
科隆在离美因茨并不遥远的下游方向。
Down-river is also an adjective.