Yeah, so also 4. We started with 10 valence electrons, we used up 6 of those as bonding electrons, so we have 4 left, which will be lone pair electrons.

对，也是四个，我们从十个价电子开始，只用了六个来成键，因此我们还剩下四个，它们将成为孤对电子。

麻省理工公开课 - 化学原理课程节选

It used to be this big, thick thing and you would go there everyday to look up and everything was in there.

它过去是一份很大很厚的报纸,你每天都会查阅资讯,上面有所有需要的资讯

耶鲁公开课 - 金融市场课程节选

Well, again, it used to be believed that the brain is wired up like a computer, like a PC or a Mac or something like that, but we know this can't be true.

人们曾经以为大脑是像计算机那样,组装起来的,像台个人电脑或苹果电脑,但我们知道这种观点是不对的

耶鲁公开课 - 心理学导论课程节选

So, maybe you wanted a really fine pot of the kind you used to be able to walk to the corner and pick up at a pottery shop, but you can't get now, so you would want to buy what the Corinthians sell. Guess what?

所以或许过去在大街的,任意一间陶器店里,你都能找到精致的陶盆,现在却找不着,那么你该选择,科林斯人的哪些商品呢,想想看

耶鲁公开课 - 古希腊历史简介课程节选