When it cuts it leaves sticky ends or un-base paired single stranded regions on each end of the part its cut and that's just a property of many restriction enzymes; not all, some cut blunt,just right down the middle.

它切割后会留下两个粘性末端,或者未配对的单链部分,这是许多限制性内切酶的特性,但不是全部,有些限制性内切酶是从中间钝切的

耶鲁公开课 - 生物医学工程探索课程节选

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

And just to give you some small defense of that approach, I always like to ask students, "Suppose we didn't have a single historical record, no newspaper, no diaries. You know nothing totally reliable for what happened in the latter part of the eighteenth century in America."

我可以给你们一个反驳的理由,我总是问学生们,"如果没有历史文献,报纸和日记,那么对于美国十八世纪后期的历史,你们将一无所知"

耶鲁公开课 - 古希腊历史简介课程节选