汽车公司已经在使用 3D 打印机制作真实大小的汽车零件模型，医疗公司也在使用这项技术制造人造身体部件。
Car companies already use 3D printers to make life-size models of car parts, and medical companies use the technology to make man-made body parts.
除了可以使得汽车更加轻巧外，这还意味着制造商能够使用同样多的原料制造更多的部件，而这又使得零件的成本减少。
Besides helping to make cars even lighter, this also means producers can make more components from the same amount of metal, which lowers the cost of the components.
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