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船在波濤起伏的海浪中劇烈搖擺。The boat rolled heavily in the troughs between the waves.偉大如穆恩者，也有狀態(tài)起伏的時候。Moon, as great as he is, has had some inconsistent days.我放眼綿延起伏的群山。I looked across the mountains, ridge upon ridge....

“起伏的”的英語可以翻譯為：fluctuant，rolling，undulant，undulate，undulatory ...