英语语法分析

Have you ever had an injection of procaine before?

你以前打过普鲁卡因吗？

That's the effect of the procaine, and it'll soon be over.

是因为注射了普鲁卡因的关系，很快就会恢复。

What are the principles of the identification of Procaine Hydrochloride.

盐酸普鲁卡因的鉴别原理是什么。