The initial portion of the stress-strain diagram for most materials used in engineering structures is a straight line.

在工程结构中使用的大部分材料最初的应力应变图是直线型的。

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The increase in average grain size of a polycrystalline material, for most materials, an elevated-temperature heat treatment is necessary.

在多晶体材料中晶粒平均尺寸的增加，对大多数材料来说，这需要在一定温度下进行热处理。

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The increase in average grain size of a polycrystalline material; for most materials, an elevated-temperature heat treatment is necessary.

多晶体材料中晶粒尺寸的增大，对大多数材料来说，晶粒长大只在升高温度加热的时候发生。

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As the first major airliner to use lightweight composite materials for most of its construction, the 787 Dreamliner also promised 20% better fuel economy and 30% lower maintenance costs.

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We were trying to build a boat that had not only to be capable of crossing our largest ocean but had to do so using unconventional and for the most part unproven materials.

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The material choices for additive manufacturing are very limited, and for the most part, the materials are not strong or durable enough to be used in an actual product.

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