Water pollution, which is one of the main environment problems, is faced by cities of our country.

水污染是我国城市面临的主要环境问题之一。

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The paper gives detailed introduction of the developing environment, system functional model design. The main technological problems were discussed also.

阐述了管理系统的开发环境、系统功能模块设计，并探讨了系统集成的主要技术问题。

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However, the landslide is the one of main problems for construction in complex geological environment as it usually gives rise to the probability of slope failure.

但由于大量工程建设地处复杂的地质环境条件区，边坡失稳时有发生，滑坡灾害成为山地丘陵区工程建设所面临的主要问题之一。

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"The main problems are that the airport environment is an alien one and processes such as check-in and security require co-operation with strict guidelines, " Ms Gough said.

BBC: Autism guide for airport travel