我们倾向于认为人们选择金属材料、陶瓷材料、纤维材料是根据它们在特定用途的条件下的物理性质，如机械性表现。
We tend to think that societies choose materials-metals, ceramics, fibers - according to their physical qualities such as mechanical performance, under a given set of conditions of use.
为某一工具选择特有的材料，通常由该工具在正确的操作下所需的机械性质决定。
The specific material selected for a particular tool is normally determined by the mechanical properties necessary for proper operation of the tool.
机械设计和机械设计教学需要大量的信息，从材料性质到设计公式、从计算软件到零件与设计实例库。
Mechanical design and design education require large amount of information, from material properties to design formulas and standards, from computing software to part and case libraries.
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