The article presents the problems existed in urea hydrolysis system, analyzes the reasons, and puts forward revamping scheme.

针对尿素水解系统在生产中暴露出来的问题，分析问题存在的原因，提出了改造方案。

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The problems existed in the portable air sampler is summarized through practice, and make an exhaustive study on the improve method.

通过实践总结出携带式大气采样器存在的问题，并对其改进方法做了详细的研究。

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The paper has analyzed the problems existed in this work and expounded on how to improve the current system for the petrochemical enterprises.

针对目前此项工作中的问题进行了分析，并阐述了对石化企业现行安全评价体系的改进设想。

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These social problems also existed before Ms.Tymoshenko and her allies launched the Orange Revolution, in which they pledged reforms and prosperity.

VOA: standard.2010.02.14

Now that the mutual fund scandals are ancient history and the SEC (speaking on behalf of the mutual fund industry) assures us that the few problems that ever existed in the industry have been eliminated (none of which the SEC uncovered on its own), attention has shifted to abuses involving retirement plans that generally use mutual funds- the defined contribution plans.

FORBES: An Extreme Makeover Due For Defined Contribution Plans: 401(k), 403(b) and 457s All Under Attack (June 1, 2007)

But Mr Hennighan said problems existed in the town before the supermarket giant made its decision.

BBC: Machynlleth: Campaign to rejuvenate 'rundown' town

But Sir Alec said that economic problems now existed, for example in the labour market, that Keynes had not foreseen.

ECONOMIST: Sir Alec Cairncross