They have to pay--the premium has to cover the costs, so it was tough to get someone to buy life insurance even though they really needed it--it was such a good idea for them.

因为保费必须要超过保险公司的成本,因此,尽管寿险很好,人们也需要它,但是真正要说服人们购买,却是很困难的

耶鲁公开课 - 金融市场课程节选

So if you buy like, a very good healthy food today,

所以如果你今天买到了健康的好食物，

问上门厨师 - SpeakingMax英语口语达人

The other is I take a mortgage, I buy a house, I pay it off, I go into a heavy indebtedness but with a good rational reason and it all works out in the end.

另一种情况是，我分期贷款买了一套房子，我还清了贷款，却债台高筑,这样，于情于理都能说通,而且，最终无事一身轻。

斯坦福公开课 - 经济学课程节选

If you know the secrets of a company, if you know some good news about the company before the public does, you could buy the shares of the company and experience the profit when the price goes up.

如果你掌握了公司内幕信息,你能比公众更早得知,公司的利好消息,那你就会去购买公司的股票,然后从股票升值中获利

耶鲁公开课 - 金融市场课程节选