Engineering drawing: A graphical language used by engineers and other technical persons associated with the engineering profession. The purpose of engineering drawing is to convey graphically the ideas and information necessary for he construction or analysis of machines structures, or systems 工程图:工程师及工程行业的技术人员所用的图形语 言。工程图的目的是用图形来转达机器、结构或系统 的建造及分析所必需的概念和信息
Engineering drawing: A graphical language used by engineers and other technical persons associated with the engineering profession. The purpose of engineering drawing is to convey graphically the ideas and information necessary for he construction or analysis of machines, structures, or systems. 工程图：工程师及工程行业的技术人员所用的图形语 言。工程图的目的是用图形来转 达机器、结构或系统 的建造及分析所必需的概念和信息
What is Dimensions Dimensions: Length, time mass or combinations of these quantities serving as an indication of a physical quantity 尺寸(量纲):长度、时间、质量或三个量的结 用来表示一个物理量。 Dimensions:尺寸标注
⚫ Dimensions: Length, time, mass or combinations of these quantities serving as an indication of a physical quantity. ⚫ 尺寸（量纲）：长度、时间、质量或三个量的结合， 用来表示一个物理量。 What is Dimensions ？ Dimensions:尺寸标注
Engineering Drawings o The result of a designer's efforts must be translated into a set of instructions to the shop in order that the part or parts can be fabricated and assembled fabricate 制作,构成;捏造,伪造;装配 assemble ⅵ装配,组合 为了加工零件和组装零部件,设计者设计 件必须被表达成可以让车间看懂的形式
Engineering Drawings ⚫ The result of a designer's efforts must be translated into a set of instructions to the shop in order that the part or parts can be fabricated and assembled． fabricate vt. 制作，构成；捏造，伪造；装配 assemble vt.装配，组合 为了加工零件和组装零部件，设计者设计的零 件必须被表达成可以让车间看懂的形式
Thus, a set of engineering drawings' are prepared showing the sizes, shapes, and dimensions to which parts are to be made 于是,一套表明零件尺寸、形状的加工图就
⚫ Thus，a set of engineering drawings' are prepared showing the sizes，shapes，and dimensions to which parts are to be made． 于是，一套表明零件尺寸、形状的加工图就产生了
o Unfortunately, many designers consider this phase of engineering design to be trivial o Realistically speaking, however, it may be of greater importance than the design solution itself. ●不幸的是,一些设计者认为工程设计 式是无足轻重的 ●事实上,它可能比设计本身更重要。 trivial:无足轻重的价值不高的 Realistically:实际上
⚫ Unfortunately，many designers consider this phase of engineering design to be trivial． ⚫ Realistically speaking，however，it may be of greater importance than the design solution itself．. trivial:无足轻重的,价值不高的 Realistically:实际上 ⚫ 不幸的是，一些设计者认为工程设计的表达形 式是无足轻重的。 ⚫ 事实上，它可能比设计本身更重要