羊毛脂：听起来让人感觉柔软舒服，就像您平日用的那松软的、附着绒毛的护膝。

Lanolin: it sounds soft and comforting, like the kind of fluffy material you'd use to protect a grazed knee.

youdao

那油腻腻的东西便是皮脂，便是已经死翘翘的脂肪细胞，等同于羊毛脂，而它却被冠冕堂皇地用于制蜡。

That sticky substance is sebum, which is made from the delightful recipe of wax and the remains of dead fat-producing cells.

youdao

而我要在一个大平锅里掺上水放在炉子上加热.要是放的水太少,那脂肪分解成动物脂后就会变黑.

Me, I'm supposed to put a big pan on the stove and fill it most of the way with water. Too little water, and the fat will darken as it separates into tallow.

youdao

I do want to talk about one important subject which you might not have thought too much about and that's lipids, because lipids are so important to the structure of the body because they make up the membranes that form the cells that are the fundamental units.

我的确想要讨论一个重要的主题,这个主题也许你们都没有深入思考过,那就是关于脂类的问题,脂类对身体结构形成十分重要,它是组成细胞膜的基本单位,而细胞膜能够维持细胞形态

耶鲁公开课 - 生物医学工程探索课程节选