专英考点

Unit 1

Mechanical strength 机械强度

Thermal conductivity 热导率

On only rare occasion does a material possess the maximum or ideal combination of properties.thus,it may be necessary to trade off one characteristic for another.

只有在极少数情况下材料在具有最优或理想的综合性质。因此，有必要对材 料的性质进行平衡。

热容 heat capacity

电磁辐射 electro-magnetic radiation

材料工程学主要解决材料的制造问题和材料的应用问题

Material engineering mainly solve the problem of materials processing and application.

Unit 2

Advanced materials 先进材料

Stiffness 硬度

Metals are extremely good conductors of electricity and heat,and are not transparent to visible light ;a polished metal surface has a lustrous appearance.

金属导电、导热能力特别强，对可见光不透明；一个抛光的金属表面具有泽。

高性能材料 high-performance material

合金 alloy

半导体材料的电性特征介于导电材料（如金属、金属合金）与绝缘体（如陶瓷材料聚合体材料）之间。

Semiconductors have electrical properties that are intermediate between the electrical conductors(viz.metals and metal alloys) and insulators(viz.ceramics and polymers).

Unit 3

Atomic number 原子序数

Positively charged protons 带正电的质子

Metals behave differently than ceramics ,and ceramics behave differently than polymers.

金属性质不同于陶瓷，陶瓷性质不同于高聚物。

微观结构 microstructure

原子量 atomic weight

原子核中质子和中子的量的总和就是原子量。

The weight of an atom indicates how many protons and neutrons in the nucleus.

Unit 4

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