如果不懂，我可以用日语写。

If not, I can write in Japanese.

youdao

如果不懂当地的语言，那么你就会被完全排除在当地文化之外。

As a person who doesn’t know the native tongue you are completely excluded from the culture.

youdao

如果不懂得使用这个工具，就难以成为高效的AIX系统管理员。

You really can't be an effective AIX systems administrator without knowing how to use this tool.

youdao

So if you run into a problem set that just, you don't get, all right? Seek help. Could be psychiatric help, could be a TA. I recommend the TA.

所以如果你碰到了一个,你不懂的问题，好么？求助，可以是精神科，可以是一个助教，我推荐助教。

麻省理工公开课 - 计算机科学及编程导论课程节选

And if you speak other languages that I don't, you can nonetheless compel me to speak them at least in subtitle form.

如果你不懂英语的话，那也只能,改变下字幕了。

哈佛公开课 - 计算机科学课程节选

If I'm saying something that you don't understand, the chances are pretty good that there's 25 or 50 other students in the class who don't understand it either.

如果我正说着什么你不懂的东西，那时就是举手的好机会,因为有25或50个别的学生,也不懂。

耶鲁公开课 - 死亡课程节选