名词
中文翻译：下降差异
同义词：
['declining difference', 'decreasing difference', 'diminishing difference']
例句：
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1. The population of the city is experiencing a declining difference in age structure.
该市的人口年龄结构正在减少。
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2. The company's profits are decreasing due to increased competition.
由于竞争加剧，公司的盈利正在减少。
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3. The temperature has been decreasing since last week.
自上周以来，温度一直在下降。