y potential corrective measures 4 、汉译英, 10分密度: 材料的密度是指单位体积材料的质量。另外一个术语是比重, 其表示某种材料的密度与水的密度的比值, 因此, 比重没有单位。对于如飞机和航天结构、汽车车体和部件, 以及其他一些产品, 当能量消耗和动力限制是主要考虑的因素时, 减轻重量尤其重要。在设计先进的设备与机器和设计诸如汽车等消费品的过程中, 采用新的替代材料来减轻重量和降低成本是一个应该着重考虑的问题 Density: the density ofa material is its mass per unit volume. Another term id specific gravity, which express a material ’s density in relation to that of water, and thus, it has no units.Weight saving is important particularly for aircraft and aerospace structures, for automotive bodies ponents, and for other products where energy consumption and power limitations are major concerns. Substitution of materials for the sake of weight saving and economy isa major factor in the design both of advanced equipment and machinery and of consumer products, such as automobiles.
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