动词
中文翻译：下降
同义词：
['decrease', 'diminish', 'fall', 'reduce']
例句：
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1.The population of the city has been declining steadily for the past decade.
过去十年里，这个城市的人口一直在稳步下降。
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2.The economy is expected to decline slightly in the coming year.
预计未来一年经济将略有下降。
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3.The temperature has been declining since last week's rain.
自上周下雨以来，气温一直在下降。