由于没有教练以及不甚了解如何照顾自己，我受伤了，开始游泳（蛙泳）来保持健康。

Without a coach and enough knowledge about how to take care of myself, I got injured and started to swim (breaststroke) to keep fit.

youdao

他的诺言不甚可靠。

There is little reliance to be placed on his promises.

《新英汉大辞典》

他们常常对于营养学不甚了解。

They often have an imperfect grasp of nutritional science.

youdao

Specifically, what is it that American companies that, both then and now, still don't understand about China that you think you do and they don't?

美国公司对于中国的互联网行业，始终不甚了解,能否谈谈一些你知道而别人不知道的原因？

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

I think the simple fact of the matter is we don't know enough about consciousness yet to know whether or not it can be explained in physical terms.

一个简单的事实就是,我们对于意识了解甚少,还不知道是否能使用物理的方式对其进行解释

耶鲁公开课 - 死亡课程节选

I think the book has a fairly good description of it so if you don't pick up everything in the lecture, hopefully you've read that beforehand, and you can go back to it afterwards and read about things that didn't make sense.

我认为课本对DNA表述很详细,所以在课堂上无需面面俱到,希望你们之前做过预习,课后你们可以通过复习,弄懂那些不甚理解的地方

耶鲁公开课 - 生物医学工程探索课程节选