Frequency is the number of occurrences of a repeating event per unit time.
在单位时间内重复发生的次数，即频率。
Frequency is a measure of the number of occurrences of a repeating event per unit of time.
频率即衡量单位时间里重复事件发生的次数。
Frequency is a measure of the number of occurrences of a repeating event per unit of time.
频率即衡量单位时间里重复事件发生的次数。
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