abbr. 概率分部函数（Probability Distribution Function）
🗣️ 情景例句
He studied harder to improve his English.
他更加努力提高英语水平。
You don't have any strong feelings about it?
关于这件事，你没有什么意见吗？
OK. Thank you. Goodbye!
好吧，谢谢你。再见！