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waves; billows; surge
海の波浪が高くて、泳げませんでした。
The ocean waves were high, so I couldn't swim.
波浪の音を聞いて、リラックスしています。
I'm relaxing while listening to the sound of the waves.
台風で波浪が荒くなったそうです。
I heard the waves became rough due to the typhoon.