A water vole swam vigorously upstream.
一只水鼠奋力上游游。
A water vole swam vigorously upstream.
一只水鼠奋力上游游。
We swam upstream against the current.
我们逆流上游游。
The ice blocks up the river, making the upstream water unable to flow.
河道堵住了, 上游的水流不下来。
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