The paper approaches to the existing problem and cause of the drainage system in Zengchen City.

探讨了增城市排水系统存在的问题及原因。

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According to the existing problem of salt mining process, the salt mining system was innovated partly.

针对采盐工艺出现的问题对采盐工序进行了局部改造。

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According to the existing problem, the reasons were analysed, measures were adopted for prolonging operation period of pall membrane filter.

对使用中出现的问题，浅析原因，采取措施，延长了颇尔膜过滤器运行周期。

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"The problem with that body of research is that it's difficult to interpret because obviously people with existing mental health problems use cigarettes to self-medicate."

VOA: standard.2010.06.15

He said that the short term solution to the aviation capacity problem would be to develop the existing infrastructure in the south east, particularly Manston airport, which already has the ability to accommodate intercontinental flights and also has a long runway.

BBC: Manston could 'play a role' in airport capacity needs

This argument overlooks a business loan, the already existing free market solution to the problem.

FORBES: Do Tariffs Protect an Infant Industry?

The FCC makes no substantive case of a real existing problem for the FCC to solve.

FORBES: Why Verizon Wins Appeal of FCC's Net Regs