The first thing which the designer will consider is that he should select an economical material as well as a process suitable for the product.

设计人员要考虑的第一件事就是：不仅应选择适合于产品的工艺规程，而且要选择经济的材料。形容词短语。

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Select the suitable wheel. Need wheel to grind base on the workpiece material, rigidity and manufacturing requirement.

应根据工件材料、硬度及加工要求，选择适当的砂轮进行磨削。

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However, it is difficult to select suitable material of model pipes for larger model scale.

但对于较大模型比尺，很难找到理想的模型材料。

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