PDM系统是一个实现所有产品相关数据有序管理的工具，它提供给工程设计人员一个相互协作的电子环境。

PDM system is a management tool for realizing all the product data management in order. It provides engineers with an electronic environment of cooperation.

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例如，如果基因工程单单从一种安全粮食作物的一种普通食物成分的基因转移到另一种作物，这并不使消费者受到事物供给中新成分的影响。

For example, if genetic engineering simply moves a gene for a common food ingredient from one safe food crop to another, this does not expose consumers to new components in their food supply.

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就连人类的工程师，也很难处理。 这就是为什么带有水源供给，废水排污，煤气管道和电气线的旋转建筑那么稀缺的原因。

Even human engineers have difficulty with it, which is one reason why revolving buildings—with their need for water, sewerage, gas and electrical connections—are so rare.

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