要是我多懂得一些急救知识，我就能帮助他们了。

If I had known more about first aid, I would have helped them.

youdao

要是我多懂得一些急救知识，我就能帮助他们了。

If have had known more about first aid, I could help them.

youdao

I'm going to ask you to indulge me while I go back to the beginning and talk about some things that you know but I'm going to go through this pretty rapidly.

我请求你们容许我,从一些,你们已经懂得的知识讲起,不过我只会很快的串讲一下

耶鲁公开课 - 生物医学工程探索课程节选