Pfas
abbr. personal fall arrest system 防坠落系统; [医][=performic acid-Schiff reaction]过氧甲酸-席夫反应
🗣️ 情景例句
Yes, Sam?
什么事 ，Sam？
Mr. Smith is still in his fifties.
史密斯先生仍然50几岁。
Hello. You look tired today.
你好。你今天显得有点儿累。