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
Today is the perfect example.
今天就是一个很好的例子。
How many pieces are you going to buy?
你要买几个？
We seem to be three packages short.
好像少了三大箱。