介绍了有关规定的来源，简要讨论了有关规定的疑难点。

The source of some norms and a few questionable points are briefly introduced and discussed.

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留出一些资源来经常和谨慎地监测这些疑难点以及与它们有联系的因素。

Set aside resources to regularly and carefully monitor these identified problem areas and the factors associated with them.

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在设计周期中尽早地花费一些时间来确认潜在的风险领域和项目疑难点。

Take time as early in the design cycle as possible to identify potential risk areas and project problem spots.

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