So, you'll be learning in this class 512 a great preparation for 512, which is organic chemistry.

做有机化学需要知道的东西,你们学这门课程将为课程，也就是有机化学打下基础。

麻省理工公开课 - 化学原理课程节选

That must be the time you spend in preparation in studying.

那肯定是你们应该,花费来准备学习的时间。

麻省理工公开课 - 固态化学导论课程节选

You'd want to make sure that you separated the virus from all the other parts of cow skin so that your ultimate preparation was enriched in the virus and didn't contain quantities of other things that would be hazardous.

你要保证,你从所有的牛皮组织上分离出病毒,这样最终的制剂产品才会富集病毒,并且不会携带其它物质,这些物质可能带来危险

耶鲁公开课 - 生物医学工程探索课程节选