Any era of great change, great ferment, usually causes reform, anxiety, people who get worried, want to change things.

任何一个大变革的时代,大的动乱,通常会导致改革和焦虑,人们变得担忧,想要改变局面

耶鲁公开课 - 美国内战与重建课程节选

So, it's not really good enough to just have some risk of death-- it's got to be greater risk than usual.

所以，只冒某些死亡的风险,是不够的-,必须是比通常情况下更大的风险。

耶鲁公开课 - 死亡课程节选

The most common one and the one we're going to use, is what's often called big Oh notation.

也就是我们即将用的方法,就是通常被叫做大O的方法，它叫大O并不是因为。

麻省理工公开课 - 计算机科学及编程导论课程节选