Prf
n. pulse-repetition frequency的简 写
🗣️ 情景例句
I'm glad you came. You're welcome any time.
我很高兴你能来。随时都欢迎你们来。
You have to be on time. Don't be late.
只准早到，不许迟到。
There are a lot of people in the swimming pool.
游泳池里挤满了人。