There are still many obstacles and problems in existence that should be studied in implement of cleaner production.

但要在全国范围内持续有效地推行清洁生产，尚存在不少障碍与问题，急需研究与探讨。

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Hazard distribution, identification countermeasures and problems in existence during identification process are studied.

研究了危险源分布、辨识对策和辨识过程中容易存在的问题。

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This paper introduces the application of replacing coke by anthracite in limekiln, and analyses the problems in existence.

本文对白煤代焦在石灰炉上的应用情况及存在的问题进行了介绍、分析。

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With regard to minimizing the impact of groundings caused by engine problems, the existence of two competing engines could help in some situations and hurt in others.

FORBES: Why Adam Smith Isn't Welcome In The Defense Industry

He identified three critical problems in Afghanistan: the lack of legitimacy for the government, the existence of safe havens for terrorists across the border in Pakistan, and the lack of military resources.

CNN: Adviser: At least 25,000 more troops needed

In her closing remarks, Ms Bokova emphasized the existence of problems that limit access to education for large sections of society.

UNESCO: Communication and Information