abbr. 概率分部函数（Probability Distribution Function）
🗣️ 情景例句
Sorry, I've got people coming over tonight.
很抱歉，今晚有客人要来。
Whatever happens, don't worry.
不管什么事情发生，你都不要担心。
If you order in large lots, we'll reduce the price.
如果你大量订购，我们可以降价