It's the most simple-- or often called a bill-- a discount bond does not pay interest; it's sold at a discount.

它是最简单的,经常被称为国库券,它是一种贴现债券,且不付息,并以折扣价发行

耶鲁公开课 - 金融市场课程节选

Or a lot of the times when a website is compromised and you're able to steal someone's usernames and passwords, very often are the result of simple little things like this.

很多时候，当要访问的网站被人破坏了,你就有机会窃取别人的账号,和密码，正是因为这样或那样的小疏忽存在,才会导致这种事情频频发生。

哈佛公开课 - 计算机科学课程节选

It's often these very simple but powerful ideas that really take off.

这些简单的观点常常极为有力,能够产生深远的影响。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选