In the light of using top down method in the design of product with CAD, a method of feature design, which chooses proper shape feature as the datum for next design step, is presented.

针对自上而下的计算机辅助机械产品图形设计，提出了适应这种设计思维的特征设计方法，即选择合适的形状特征，作为进一步的详细设计的基准。

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First, Steps 1-3a of the top-down method are used, primarily to produce the so-called DTOs (possibly based on standards-based XSDs).

首先，请遵循自顶向下方法中的步骤 1-3a，这主要是为了生成所谓的 DTO（可能根据基于标准的 XSD）。

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The top-down method was adopted to design the software, which shorted the developing period and enhanced the system's maintainability.

软件设计采用自顶向下的方法，缩短了开发周期，提高了系统的可维护性。

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Using a bottom-up approach to his research, as opposed to Mr McCullough's top-down method of looking at the project through a geopolitical prism, Mr Parker has written the Panama story for a new generation.

ECONOMIST: The Panama Canal