I think I know who's who in that firm.

我想我知道谁是那家公司的重要人物。

The reason it works is because a salespeople tend to know who's who in their organizations and b because most salespeople will go out of their way to help another salesperson.

这招之所以有效，一是因为销售员通常比较了解公司内部人员结构。二是因为大部分销售员都愿意帮助其他销售同行。

And how do we know who a virtuous person is? We just look for someone who's flourishing.

我们如何知道一个人是不是有道德的人？我们只需要找那些富足的人。

The people who are in the know -know who's trustworthy as a borrower and who has a good prospect of paying it back -but if I go in there ignorantly, I'm going to get stuck with the worst stuff.

那些行家老手们，就知道哪些借款人是可信的，钱借给谁还款的把握比较大，但如果我懵然不知就把钱投进去了，就可能会落得个血本无归的结果。

I know that maybe you're thinking about your health or somebody who's close to you who has health problems.

你可能在担心自己的健康或者是与你亲近的人的身体状况。

A woman called and asked, "Do airlines put your physical description on your bag so they know who's luggage belongs to who?"

一位女士打电话询问：“航空公司会把你的外貌特征写在你的包上，这样他们就知道行李是谁的么？”

You may know someone who is afraid of spiders, or perhaps heights, but who's afraid of innocent-looking shellfish?

你可能知道，有些人害怕蜘蛛或恐高，但是谁会害怕看似天真的（innocent-looking）甲壳类动物？

It's better to ask "May I know who's calling?" than "who is this?" or even "who's calling?"

最好问“我能问是哪位打来的吗？ ”，而不是“谁呀？ ”？

We bring to our mind somebody we know who needs our help, someone who's suffering that we know. (Or it could be an animal.)

我们观想某个正在受苦的人，我们认识的、需要得到帮助的人(或者动物也可)。

Let me give a few examples, and the names appear to be "Who's Who" in American business, names we all know as Ajax, Hoffman, Unipress, Cissell and some excellent foreign manufacturers.

让我举几个例子，名字似乎是“名人录”在美国的业务，我们大家都知道的名字作为阿贾克斯，霍夫曼unipress, Cissell和一些优秀的外国制造商。