to begin
to bend over
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→qi3fu2 • qǐfú
to rise and fall
rise and fall, rising and falling, rises and falls, to undulate, undulate
他 的 心情 随 着 比赛 结果 起伏。
His mood rises and falls with the result of the game.
海面 随 风 起伏。
The sea rises and falls with the wind.
他 的 情绪 起伏 不定。
His emotions rise and fall unpredictably.