These won't be graded, you don't have to turn them in, it's just to give you some extra practice if you want while you're studying for the exam.

这些题目不会记分，你们也不需要交上来，只是如果你需要的话，这可以让你,在准备考试的过程中得到更多的训练。

麻省理工公开课 - 化学原理课程节选

So, you cross link all the proteins in the virus, and you make a particle that looks like a virus but it can't act like a virus any longer because it can't replicate.

当病毒中所有的蛋白质交联后,就得到了一种看上去像病毒,却无法致病的病毒,因为这种病毒不能进行复制

耶鲁公开课 - 生物医学工程探索课程节选

So in that numbers game, the game when all of you wrote down a number and handed it in at the end of last time, the players were who? The players were you. You'all were the players.

在那个数字游戏中,你们每个人都写下了一个数字,然后在下课前交了上来,谁是参与人呢,你们就是参与人

耶鲁公开课 - 博弈论课程节选