"Definitely being in a different country and learning about American culture, American education system and everything else geting a degree here will definitely be valid back in my country so I am very lucky to be here and my goal right after graduation I want to look for some sponsorship opportunities and also being able to stay in the United States to do some kind of work with some Tennis academy and travel a litle bit and play in some Tennis tournaments."

VOA: standard.2009.12.14

And yet get a valid test. Sometimes it can be timing. If you're running multiple processes.

有些时候当你运行多线程时,是因为时间的原因。

麻省理工公开课 - 计算机科学及编程导论课程节选

What must this experiment have the potential to do, to be a valid scientific experiment?

实验必须有做什么的能力,才能被称为一个有效的科学实验呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

"We all know that contracts are valid in this country, but they need to be looked at,"

VOA: standard.2009.03.15

You have to be careful that this first law of Newton is not valid for everybody.

大家需要注意的是,牛顿第一定律并非所有情况都适用

耶鲁公开课 - 基础物理课程节选

U.N.spokesman Gordon Weiss says that cannot be used as a valid excuse.

VOA: standard.2009.04.26