The primary cause of this concern is the value that American society in general assigns to physical appearance.

人们关注的主要原因是美国名众重视其外表。

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Employment is a social issue of great significance, which has aroused general concern in exploring the cause of this problem and the methods to solve it.

就业问题是十分重要的社会问题，关于这一问题的原因探讨和解决办法研究已成为社会广泛关注的热点。

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Although the situation in Egypt is evolving rapidly, reports from Egypt concerning these two domains are a cause for deep concern, the Director-General said.

UNESCO: Director-General launches heritage and press freedom alert for Egypt | United Nations Educational, Scientific and Cultural Organization

"Viktor Bout has been indicted in the United States, but his alleged arms trafficking activity and support of armed conflicts in Africa has been a cause of concern around the world, " said US Attorney General Holder in a statement.

BBC: Extradited 'arms dealer' Viktor Bout arrives in US