英语专业翻译课课件
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LESSON 2Properties of Materials材料的特性The properties of a material are those characteristics that help modify and distinguish one material from another.材料的特性是变更和区分一种材料和另一种材料的特征。
All properties are observable and most can be measured quantitatively.所有的特性都是可见的,而且大多数是可以定量测量的。
Properties are classified into two main groups, physical and chemical properties材料特性可分为物理特性和化学特性两大类。
Physical properties involve no change in the composition of the material .物理特性指的是材料成分不发生改变的特性。
Chemical properties are associated with the transformation of one material into another化学特性指的是能够结合一种材料变成另外一种材料的特性。
.Physical properties are, in turn, arbitrarily subdivided into many categories.物理特性,可以被任意地分为许多种类。
These subdivisions bear names such as mechanical, metallurgical , fabrication ,general ,magnetic ,electrical thermal ,optical , thermonuclear ,and electro-optical.这些细类名称包括机械特性,冶金特性,装配特性,通用特性,磁性特性,电子特性Regardless of the name of subdivision ,physical properties result from the response of the materials to some environmental variable ,such as a mechanical force, a temperature change, or an electro-magnetic field. In the following, the mechanical property of materials will be discussed.这些特性是由于材料在环境变化下形成的反应而产生,比如机械力,温度的改变,电磁场。