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tide; tidal current
tendency; drift; trend
海の潮流が強くて、泳ぐのは危険です。
The ocean current is strong, so swimming is dangerous.
変わる潮流を見て釣りの時間を決めた。
I decided on the fishing time by observing the changing tide.
漁師は潮流を見て出発時間を決めました。
The fisherman decided the departure time by observing the tidal current.