A triangle is a basic drawing operation on which you can build more abstract operations.

三角形是基本的绘图操作，在此基础上可建立更为抽象的操作。

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It is hard to build models to scale from a drawing.

很难根据图片按比例制作模型。

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Build up machine spare parts list and drawing.

编制设备备件图册。

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Build up machine spare parts list and drawing.

编制设备备件图册。

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