基本信息
课时作业23 life in the future ⅰ.阅读理解 (2015·辽宁师大附中月考) imagine having an idea, drawing it on paper, bringing it to a store and seeing it turned into a physical object. this is now possible with the help of 3d printers. such machines were once used just by universities and big companies. but now, stores with 3d printing
