对于我们说谎的时间和频率，外部条件也会造成影响。
External conditions also matter in terms of when and how often we lie.
获得应允是设定预期的好时机，可以保证你的用户知道他们收到你的电子邮件的频率以及条件。
Asking for permission is a great time to set expectations, ensuring your customers know how often, and under what conditions, they will receive email communications from you.
条件频率分布可能比普通的直方图更有趣。
Conditional frequencies are perhaps more interesting than plain histograms.
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