美军导弹消耗速度引五角大楼震惊，进攻哈尔克岛是否过于冒险？
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With the explosion of 3D printing, designing 3D objects has become an even more important problem. And it's a complicated one. We need to design complicated objects that precisely interface with each other. And often we don't want to just design a single object, but classes of objects, parameterized by variables. And we need to do this in collaboration.