Nobody knows, but there's a theory which won't answer your question but will put it into a broader context.

没有人知道答案,但有这么个理论,它无法回答你的问题,但却能让你从更宽广的视角来看这个问题

耶鲁公开课 - 心理学导论课程节选

open your textbook and put a circle around question number one.

打开你的课本，在第一个问题上画一个圈。

Would you please 实战 - SpeakingMax英语口语达人

And he has left blanks here, question marks here and says it is advantageous to put them in rows and to form a table.

他左边栏是空的，还有问号，他认为,将元素以行列排成一个表格是很有好处的。

麻省理工公开课 - 固态化学导论课程节选

PROFESSOR 2: -- other, it could have said - who or zort or -- PROFESSOR: Yeah, sorry, that was part of the question, I could have a picked foobar could put anything in here.

教授2：另外一个对象？,这可以说是其他对象或者-,教授：对，很抱歉，这是问题的一部分，我可以写一个,可以放进任何东西的代用符。

麻省理工公开课 - 计算机科学及编程导论课程节选

Starting at the beginning of the third week of class that is not next week but the week after on each Monday I'm going to put up a brief question or set of questions, which you have to answer and your answers need to be sent to your teaching fellow.

本课程将于开学后三周开课,也就是自下下周开始,每周一上课,我会提出一系列问题,要同学们思考并回答,大家的答案要在周五前交给研究生助教

耶鲁公开课 - 心理学导论课程节选