形容词
中文翻译：平均的
同义词：
['average', 'common', 'typical']
例句：
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1. The mean temperature for theyear is 15 degrees Celsius.
该年的平均温度为15摄氏度。
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2. The mean of a set of numbersis the number that has the average value.
一组数的平均值是具有平均值的数字。
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3. The mean life expectancy of apopulation is calculated by taking the average ofall individual lives.
人口的平均预期寿命是通过计算所有个体生命的平均值得出的。