动词
中文翻译：突然下降
同义词：
['drop', 'plunge', 'fall']
例句：
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1. The temperature has suddenly dropped by10 degrees.
温度突然下降了10度。
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2. The stock price has plungedafter the announcement of a new product.
在宣布新产品后，股价暴跌。
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3. The rainhas fallen in sheets, causing flooding inthe city.
雨水倾盆而下，导致城市洪水泛滥。