名词
中文翻译：中间率
同义词：
['average rate', 'median rate']
例句：
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1.The middle rate of the population is 50%.
人口的中间率是50%。
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2. The company's profitability has been in the middle range for several years.
该公司的利润水平在过去几年一直处于中等范围。
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3.The middle rate of the traffic flow is crucial for the design of the road network.
交通流的中间率对于道路网络的设计至关重要。