undulation
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この土地は起伏が激しく、歩くのが大変だ。
This land has steep ups and downs, making it hard to walk.
感情の起伏が激しいと周囲も疲れてしまう。
When someone’s emotions fluctuate wildly, those around them also become exhausted.
起伏に富んだ人生だったと彼は振り返った。
He looked back and said it had been a life full of ups and downs.