名词
中文翻译：下降的物质
同义词：
['decrease', 'decrease in quantity', 'diminish', 'reduce', 'fall', 'decline']
例句：
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1. The temperature has dropped significantly since the start of the season.
自季节开始以来，温度已经显著下降。
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2. The amount of water in the reservoir has decreased due to evaporation.
由于蒸发，水库中的水量已经减少了。
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3. The company's profits have declined over the past year.
过去一年里，公司的盈利已经下降。