As the main carrier of urban traffic, urban roadway system's limitation on traffic is the important aspect of cause of problem.

城市道路系统作为城市交通的主要载体，它对交通的制约因素是问题成因的重要方面。

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One major cause of this problem is the confusion over food expiration labels, which are currently not regulated by the government.

造成问题的一大原因是食物过期标签混乱，目前不受政府监管。

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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

General Secretary Russell Hobby said the cause of recruitment problem was a combination of the negative "rhetoric that the profession was subject to, the ever-rising targets and the fear of Ofsted is a huge trigger for this".

BBC: Schools 'struggling to recruit head teachers'

The pesticide DDT was found to be the cause of the problem as its use resulted in a thinning and subsequent cracking of their egg shells.

BBC: Derby Cathedral video proves peregrines hunt by night

And sure enough I saw the cause of the problem: my server was shut off.

FORBES: The Guy From Dell Thinks I'm A Dope...And He's Right