The Army launched a study into possible causes.

VOA: standard.2009.12.25

It's possible that the causes of death are the same; it's possible they've changed, but we'll see.

可能死亡原因还是一样的,也可能已经不同,我们一会儿就知道了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, it's possible that the very fact that we're going to die causes an interaction effect with our life so there's an upside to it.

所以，我们会死这个事实可能会,引起对我们生命的一种相互影响,是一种向上的影响。

耶鲁公开课 - 死亡课程节选

Work continues on possible genetic causes.

VOA: special.2009.09.15

"I think a solution to end this piracy, or to reduce it significantly, is possible and it should be done with cooperation of the local community, while at the same time addressing the root causes of the problem,".

VOA: standard.2009.10.30