There are different kinds of cholesterol, and the first cut that people made at this were saying that there are things called HDL and LDL, which is high-density lipoproteins and low-density lipoproteins, the LDL.

胆固醇分为许多种,人们分离胆固醇时,最早得到的馏分是HDL和LDL,HDL即高密度脂蛋白,LDL即低密度脂蛋白

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Okay, now let's make this first battle I'm going to describe for you to be as clear cut as we can make it, and it probably never was like that.

好的 现在,让我们打响第一场战斗,我们做得尽量简洁些,也许事实上的战斗并非是这样

耶鲁公开课 - 古希腊历史简介课程节选

The first step is we had to be able to take this circular DNA and cut it to create a site for our new gene to be added.

第一步是切割环形DNA,以创造出一个整合新基因的位点

耶鲁公开课 - 生物医学工程探索课程节选

Well the first step would be to cut open the plasmid with a particular restriction enzyme, and then what if I take that same restriction enzyme and I cut up the DNA that I'm interested in.

第一步是用某种限制性内切酶把质粒切开,然后用同一种限制性内切酶,切出我想要的DNA

耶鲁公开课 - 生物医学工程探索课程节选