| 单词 | rising and falling |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔even〕House prices keep rising and falling but they should eventually even out.房价一直时涨时落，但最终应该会趋于稳定。牛津高阶〔singsong〕A monotonously rising and falling inflection of the voice.平板的声调：嗓音单调地升降起伏美国传统〔undulation〕A regular rising and falling or movement to alternating sides; movement in waves.波动，起伏：有规律地升起和降落或轮换侧面的运动；波状运动美国传统 |
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