up的用法（from a point further up the river）

downstream ★☆☆☆☆

ADV 副词顺流而下;向（或在）下游方向 Something that is moving downstream is moving towards the mouth of a river, from a point further up the river. Something that is downstream is further towards the mouth of a river than where you are.

请问老师，这个成分from a point further up the river. 怎么理解？

from a point further up the river

从河流上游的某个地方

1. from a point （名词）further up the river （“河流上游”，副词 + 介词短语，作point的定语。）

2. far （远）——further（更远一些），修饰介词短语up the river。

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