名词
中文翻译：突然下降
同义词：
['fall', 'plunge', 'plummet']
例句：
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1.The stock price suddenly dropped by 20% yesterday.
昨天，股价突然下跌了20%。
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2.The temperature suddenly dropped to below freezing point.
温度突然降到冰点以下。
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3.The economy is expected to drop sharply in the coming months.
预计未来几个月经济将急剧下滑。