"There are serious question marks within the international community regarding the purpose and nature of Iran's program and these need to be clarified."

VOA: standard.2010.06.09

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

My hope in this class is to bring up many more question marks than periods.

我的希望是本课程培养的问号要比句号多。

哈佛公开课 - 幸福课课程节选

These question marks are not the string yet right?

这些问号还不是那个字符串，对不？

哈佛公开课 - 计算机科学课程节选

The second thing is try every question because I give part marks.

第二件事就是尝试所有的问题,因为我会给部分分。

麻省理工公开课 - 固态化学导论课程节选

The educator, Neil Postman once said, " "The kids enter schools as question marks and they leave as periods."

教育家Neil，Postman曾经说过，“孩子进校时像问号而毕业时像句号“

哈佛公开课 - 幸福课课程节选