And for sake of argument, there are no amputees among the chickens and the pigs.

它走到农地里然后它看到了,20个头和56只脚。

麻省理工公开课 - 计算机科学及编程导论课程节选

System of linear equations. What are the equations here? Well, I could say, you know, the number of pigs plus the number of 20 chickens equals 20, right? Because we've got 20 heads. And then what else do I have?

如何解决这个问题呢？,用线性方程式的办法来解决，等式是什么呢？你应该知道,猪的数量加鸡的数量等于,对吧？因为我们有20个头？

麻省理工公开课 - 计算机科学及编程导论课程节选

This is a lead in to what we'll talk about next week.

顺便给下周要讲的内容起个头

耶鲁公开课 - 生物医学工程探索课程节选

And that's all that's big enough to pass through or small enough to pass through. And if we go up even just one row on the periodic table to potassium, what we actually see is now that it's going to be too large, and, in fact, a potassium solvated with one water molecule won't go through our channel.

就是这样刚好大到它通过,或者说刚好小到它通过,即使我们再沿着周期表往下走仅仅一行到钾离子，我们看到的就将是它的个头太大了，实际上，溶解于一个水分子的单个钾离子,不能穿过我们的通道。

麻省理工公开课 - 化学原理课程节选

We don't really have a clue yet, or not much of a clue, as to how you could even so much as begin to-- it's not that merely that we don't have the details worked out.

毫无头绪,或者说,无从下手,你如何在这种情形下开个头,我们不只是不知道细节如何

耶鲁公开课 - 死亡课程节选

Pick an integer, somebody.

多少个头？来个人选个整数。

麻省理工公开课 - 计算机科学及编程导论课程节选