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山西省阳城县2017高考英语阅读理解一轮优选练习（7）及答案 【2017高考英语福建省联考试卷】 techniques , but he admitted there would be difficulties in meeting his goal . “ For example , if you run out of ink while printing on paper , you will throw that paper away . But you cannot throw half-completed buildings away if your material gets stuck , ” he said . Although the printed house is not available to visit , there is a chance for people in Shanghai to see items printed in 3D. The Belgium-based company Materialise NV held a 3D printing exhibition in Shanghai that started in late 2017 and ended in the middle of 2017 . The company is eager to show Asia what is possible with 3D printing . “ All the pieces shown here are what cannot be made through traditional techniques . A good example of this customization is hearing aids . More than 10 million people already use 3D printed hearing aids, all made according to the size of their ears , ” said Wim Michiels , executive vice-president at Materialise NV . “ You can produce anything whenever and wherever you like . You don’t need to set up production lines for pieces that only need a limited amount of products . Setting up a production line is a lot of work . It takes a long time and is very expensive for a limited number of pieces , ” said Michiels . Kim Francois , managing director of Materialise China , said their European and American clients have already taken the next step toward additive manufacturing with small series production such as hearing aids . | 
