swellings， heaving and subsiding ; The waves toss.
波涛起伏的 choppy ; rolling
大海开始变得波涛起伏。
The sea began getting choppy.
youdao
抛锚的船随波涛起伏。
A ship surges at anchor.
况且，未来十年它必须行走的水面将会波涛起伏。
The water it is going to have to walk on over the next decade is going to be choppy.
He loved sleeping on ships; he thought that the rocking of the waves rocked him to sleep so he liked doing that.
他喜欢睡在船上,波涛的起伏能使他入眠,所以他乐此不疲
耶鲁公开课 - 欧洲文明课程节选
波涛起伏是一个汉语词汇，比喻情况万分危急。出处《彩色的翅膀》。
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