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An Iranian security official says 2,000 people have been killed so far after a crackdown on weeks of anti-government protests.
In Zaman's case, he and his colleagues found a way of 3D-printing material divided into chunky, square-shaped tiles. The angles of the sides of those tiles, and the precise nature of the cuts that separate them mean that, when squeezed together, they pop up into a desired 3D shape. It could be a chair, a tent-like structure, or a curved container of some kind, for instance.。业内人士推荐体育直播作为进阶阅读