At a recent seminar, many participants were worried about the fact that overpopulation may give rise to many social security problems.
在最近的一次研讨会上，许多与会者担心人口过剩可能会引起许多社会保障问题。
Yet other security problems are worse.
然而，另外一些安全问题更是糟糕透顶。
What kind of security problems should I look for?
应该查找哪些种类的安全问题？
Yet Egypt is not alone. Foreign investors worry about corruption, mismanagement and security problems across North Africa and the Middle East.
VOA: special.2011.02.04
Britain is organizing an international conference later this month to discuss the security problems.
VOA: special.2010.01.09
The U.N.says they include loss of productivity and family income, as well as violence, security problems and traffic and workplace accidents.
VOA: standard.2010.06.23
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