The layout problem of mechanical product belongs to complex three-dimensional layout problem.

机械产品的布局设计问题属于复杂的三维布局问题。

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Mechanical product design, especially complex product, usually needs cooperative work of the multiple domain expert groups who distribute in different departments and places.

机械产品、尤其是复杂产品的设计任务，往往需要分布在不同部门或不同场所的、具有不同领域知识的专家群组协同合作完成。

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Mechanical product concept design is complex and ill-structured. A complex mechanical system can be hierarchically decomposed into some simple sub-systems, with each sub-system designed differently.

机械产品概念设计是一个复杂的、病态结构的问题，它需要多种知识和求解策略的支持。

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