Pma
[化] 均苯四酸
🗣️ 情景例句
Don't be upset, Malcolm.
别懊恼了 Malcolm。
If you would have a thing well done,do it yourself.
想把事情来做好，就得亲自动手搞。
In the library she has got books on many different subjects.
在图书馆里她准备了各种科目的书籍。