Prf
n. pulse-repetition frequency的简 写
🗣️ 情景例句
I was laid off.
我下岗了。
A wicked book is the wickeder because it cannot repent.
一本坏书危害无穷。
When he began to play a tune, we had our first glimpse of the snake.
当他开始吹奏一支曲子时，我们才第一次看到那条蛇。