让他保持已使用过了的自然状态。

Just leave it in the natural manner as you have used it.

youdao

我不要你那些用过了的旧东西。

I don't want your old hand-me downs!

youdao

酿酒专用干酵母：在酿酒过程中产生的副产品，你想要你亲爱的狗狗吃那些用过了的，滥用了的东西吗？

Brewers Dried Yeast - left over from the fermenting process to make beer. Do you really want your dog eating something that used and abused?

youdao

Yes. I've had it also many times, you usually get novacaine for cavities.

有，我也用过很多次了，通常在治疗蛀牙的时候会用到它。

麻省理工公开课 - 化学原理课程节选

We're going to really get into this next class, but I just want to introduce it to you to give us a start, and many of you have used Lewis structures in high school, but we'll be doing some much more challenging Lewis structures, I can assure you, in this class here.

其实我们下节课才会详细介绍它，但是今天我只想以简单介绍作为开始，大部分同学在高中就用过路易斯结构了，但是我们会遇到一些更具挑战性的,路易斯结构，我可以向大家保证，在这门课中会的。

麻省理工公开课 - 化学原理课程节选

I've explained my embarrassment about using terms that I really have no absolutely no idea of the meaning of except that I'm told what the meaning of them is in the books that I am reading, which are the same books that you're reading.

我已经解释过了，用这些我完全不知道什么意思的词,真的很尴尬，除非有人告诉我他们是什么意思,就像这本书里说的那样,而我读的这本书，也就是你们现在也在读的。

耶鲁公开课 - 文学理论导论课程节选