动词
中文翻译：上升和下降
同义词：
['rise and fall', 'fluctuate']
例句：
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1. The stock market is experiencing a period of volatile trading.
股市正经历一段波动不定的交易期。
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2. The temperature has been rising steadily since yesterday.
自昨天起，气温一直在稳步上升。
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3. The economy is expected to experience a period of growth before settling down.
预计经济在稳定之前将经历一段增长期。