Studies support the theory that there are several causes, instead of a single environmental cause or genetic problem.

VOA: special.2009.01.06

Many people said the problem with general levels of happiness or unhappiness rather, the cause is people have too high expectations.

很多人说,一般的快乐或不快乐水平，是由于人们有过高的期望。

哈佛公开课 - 幸福课课程节选

Don't just stop in the middle of the street because everyone is coming right behind, and it's going to cause a problem.

请不要停留在街道中央，因为街上人来人往，
你的停留是会惹麻烦的。

在纽约的感受 - SpeakingMax英语口语达人

So, the problem we have to solve to help people like MikeIs to find ways to cause those parts of cortex to develop properly when they are children or have them re-learn as adults.

因此，我们要帮助像迈克这样的人解决的问题,就是找到他们在儿童时期使,这些皮层进行发展,或者成年以后再学习的方法。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选