It also will attempt to find possible environmental reasons for the damage.

VOA: special.2009.12.15

These are all plausible reasons and possible contributors but nobody's got the home run answer yet.

这些原因听起来都很有道理,但还没有人能给出准确的答案

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Well, you know that was possible at this time for a couple of reasons.

当然 你们知道,基于一些原因,在当时是可行的

耶鲁公开课 - 生物医学工程探索课程节选