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3D printing 3D打印 A new brick in the Great Wall 构筑长城的新砖石 Additive manufacturing is growing apace in China 中国的叠层制造正在飞速发展 ALTHOUGH it is the weekend, a small factory in the Haidian district of Beijing is hard atwork. 虽然是周末，北京海淀区的一座小型工厂还在努力地运转着。 Eight machines, the biggest the size of a delivery van, are busy making things. 厂里的八台机器正在忙碌地制造产品，最大的机器有厢式货车大小。 Yet the factory, owned by BeijingLongyuan Automated Fabrication System, appears almost deserted. 然而这家隶属于北京隆源自动成型系统有限公司的工厂看上去就像废弃了一样。 This is because it is using additive-manufacturing machines, popularly known asthree-dimensional printers, which run unattended day and night, seven days a week. 这是因为工厂使用的是叠层制造设备，即广为人知的三维打印机，可以一周七天，不分昼夜的无人化运转。 The printers require an occasional visit from a supervisor to top them up with the powderedmaterials they use as their inks, or to remove a completed item, but apart from that theycan be left on their own. | 
