Identifiers-a highly unique set of distinct values with low frequency per value based on set threshold.
标识符(Identifier)—一组高度惟一的不同值，基于设置的阈值，每个值具有较低的频率。
Electrons are ejected from the object only when the frequency of the radiation is greater than a certain minimum value, called the threshold frequency.
仅当辐射频率大于某一最小值即极限频率时，物体才会发射出电子。
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