They actually monitor the movement of the fish going up river.

他们实际上在观测鱼向上游的迁移活动。

《柯林斯英汉双解大词典》

The jeeps travel on rudimentary dirt tracks (built to access Tahiti's network of hydroelectric stations) and skirt sheer drops overlooking vast river valleys while going up hills so steep you feel like gravity is no longer on your side.

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He heard a radio report that the river was going to rush up and flood the town, and that the all the residents should evacuate their homes.

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It's going to dredge the Hudson River to scrape up poisonous chemicals it dumped there years ago.

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