为减轻重量，现在许多机器零件不用金属而用塑料制造。
Many of the machine parts are now made of plastics instead of metals so that their weight may be decreased.
为减轻重量，弹体为塑料材料，弹体外罩有笼状金属圆筒。
In order to lighten weight, the bullet body is made of plastic materials; the bullet body is covered by a cage-shaped metal circular cylinder.
高速船舶推进轴系为减轻重量，采用高强度合金材料，目前常使用之材料为不锈钢SUS630。
Usually, high tensile strength alloy is used for propulsion shafting system of high-speed craft for reducing shaft weight and the diameter. In general, the stainless SUS630 is selected.
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