- Part of the challenge is speed, too, how quickly you can get these answers in terms of getting them in on time.

部分困难也会来自于速度，你多快能做出答案,能否在规定的时间做完。

麻省理工公开课 - 化学原理课程节选

Well, Wright himself described that difficulty of writing his autobiography, and these are the terms he used: I found that to tell the truth is the hardest thing on earth, harder than fighting in a war, harder than taking part in a revolution.

莱特自己描述了,自传写作的艰辛，他如是说：,“我发现说真话是世界上最难的事，比参加战争难，比参加革命难，如果尝试写自传。

耶鲁公开课 - 1945年后的美国小说课程节选

And in terms of using these equations in solving problems on the exam, and also using these constants, make sure if you think there might be any chance you're going to get any little part of a problem wrong or do a calculation inaccurately, you need to write out every single step of your thinking as you write out these problems.

而当你在考试过程中用这些公式,来解题时，加上运用这些常数，如果你觉得有可能,在某一小问上出错,或者出现计算错误，请务必把你的思路一步一步地都写出来,当你在答题的时候。

麻省理工公开课 - 化学原理课程节选