There has been much gossip about the possible reasons for his absence.

关于他缺席的原因已经有多种传闻。

《柯林斯英汉双解大词典》

Psychologists have speculated about the possible reasons for this increase in both anxiety and depression over the last fifty years.

心理学家纷纷猜测在过去的五十多年里，有关忧虑，抑郁症增加的可能原因。

youdao

The important thing is that you think about a real person and the possible reasons why they are powerful, why others choose to follow them.

最重要的是，你所想起的是一个真正的人，而且那就是他拥有权力以及其他人选择服从他的合理原因。

youdao

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

The possible reasons for increase in injuries may relate to an absolute increase in the number of inflatable bouncers, possible changes in design, as well as increased reporting of injuries.

FORBES: Inflatable Bouncer-Related Injuries Sharply Increase in the U.S.

Two hours later and our minds started to race with all the possible reasons he hadn't returned -- had the jeep broken down, or more worryingly, had he had a serious accident?

CNN: All alone on the shores of the Aral Sea

What are the possible reasons behind this?

BBC: Why are vandalism rates falling?