abbr. 概率分部函数（Probability Distribution Function）
🗣️ 情景例句
You were right, Robbie.
你做对了， Robbie。
Two in distress makes sorrow less.
同病相怜。
Sorry, there aren't any. Would you like some bottles of orange?
对不起，没有了，您要几瓶橙汁怎么样？