机械工程英语第二版翻译

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Unit1
Types of Materials 材料的类型
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.
材料可以按多种方法分类∑学家常根据状态将材料分为：固体、液体或气体。他们也把材料分为有机材料(曾经有生命的)和无机材料(从未有生命的)。
For industrial purposes， materials are divided into engineering materials or nonengineering materials. Engineering materials are those used in manufacture and bec