Researchers have been looking for the cause or causes of attention deficit hyperactivity disorder.

VOA: special.2009.09.29

cause we only have couple of minutes, Ok, it's alright So, for next time, you are going to read about Death in Venice...the introduction that's the movie we're going to watch next week ? But, what do you read for next time?

因为我们只剩几分钟了，可以，没问题,那么，下一次,你们要读《魂断威尼斯》，的介绍,这是我们下周要看的电影,那你们下一次上课之前读什么呢？

麻省理工公开课 - 电影哲学课程节选

Scientists have believed that S.I.V.did not cause a similar immune system problem for primates.

VOA: special.2009.09.08

"For all those whose cares have been our concern, the work goes on, the cause endures, the hope still lives and the dream shall never die."

VOA: special.2009.09.13

And though I now sink out of view and shall be forgotten, I believe I have made some marks which will tell for the cause of civil liberty long after I have gone."

VOA: special.2009.06.11

But he says it is cause for concern because it is a new strain, and people have not built up an immunity to it.

VOA: standard.2009.05.01

For years researchers have tried to locate one single cause for stomach cancer.

VOA: standard.2010.05.12