abbr. 概率分部函数（Probability Distribution Function）
🗣️ 情景例句
That sounds really attractive.
听起来很有吸引力。
Let difficulties occur but not the loss of courage.
纵使困难重重，也不丧失勇气。
Then, jumping into the car, he drove off as quickly as he could.
然后跳进车里，以最快的速度把车开走了。