Unit1
Types of Materials 材料的類型
Materials may be grouped in several ways. Scientists often classify materials by their state: solid, liquid, or gas. They also separate them into organic (once living) and inorganic (never living) materials.
材料可以按多種方法分類。科學家常根據狀態將材料分為：固體、液體或氣體。他們也把材料分為有機材料(曾經有生命的)和無機材料(從未有生命的)。
For industrial purposes, materials are divided into engineering materials or nonengineering materials. Engineering materials are those used in manufacture and bec...
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