But they continue to debate the early evidence of music because few archeological objects exist to prove how music developed and spread.

VOA: special.2009.08.18

I don't even exist on Wednesday I died myself on Tuesday ? How can I kill him after I'm dead?

我星期三压根就不存在了,我星期二就死了,我怎么可能在我死了之后杀了他？

耶鲁公开课 - 死亡课程节选

So, among the lessons you'll hopefully exist this course with is not just how to make something correct.

通过这些经验教训，我希望你们在这个课程中,不仅仅是知道怎样去把事情做对。

哈佛公开课 - 计算机科学课程节选

Just exactly how many spreadsheets exist and how they are being used is not known.

FORBES: Can IT Cope With Empowered End-Users?

There is little data on how many cloners exist and how much money they are reaping, but the practice can take many forms.

WSJ: Clone Wars Roil App World

But efforts at reform have been held back by a lack of information on how many gangmasters exist and how many warm bodies they provide.

ECONOMIST: Gangmasters