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It was invented by students Matthias Hahnen and Robert Doerr for a project at the University of Saarbruecken in southwest Germany. 這是德國(guó)西南部薩爾布呂肯大學(xué)的學(xué)生哈南與多爾為學(xué)校一項(xiàng)研究計(jì)劃而發(fā)明的。