1. An interval in a frequency distribution. 
   组，类频数分布的一个周期
2. The number of measurements in an interval of a frequency distribution. 
   频率分布一次频率分布的区间内计算的数量
3. the unit of frequency; one Hertz has a periodic interval of one second. 
   频率单位；一赫兹一秒内的周期间隔。
4. The difference or interval between the smallest and largest values in a frequency distribution. 
   极差频率分布上最大值与最小值之间的差别或距离
5. During the class interval 
   课间休息

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• 1. 频程
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• 2. 频率间隔
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• 3. 频率区间
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• 4. 頻率間隔
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