The mechanical drafting staff must be possessed with the ability of applying the expression methods comprehensively.

机械类制图人员必须具备综合应用表达方法的能力。

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Besides, a research and summary of the techniques applied in drafting by hand-drawing is a key factor for the students to improve their ability to design in art.

因此，笔者认为手绘设计草图的学习是学生和广大设计者提高设计能力的一个关键因素。

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