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
Perfect.
太好了。
It is easy to open a shop but hard to keep it always open.
开设店铺易，维持常开难。
I saw it with my own eyes.
我亲眼所见。