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请用适当的词完成下面这篇短文。每个空只能填写一个形式正确、意义相符的单词。

    In the past, you could draw anything you imagine on a computer and then print it out on a piece of paper. Now we have what we called 3D printing. With this, we can print things we really use.

    You need to have a 3D printer in  to print 3D objects. Now you can even buy easily in a mall. They might be as small as the size of a ring  even as huge as a room. It on what object you are going to make. You need a computer to make the design and then send your design to the printer.

    Jason, a dentist, had a patient  a toothache. After looking over the patient carefully, Jason found out bad tooth. It was such a terrible situation  he decided to pull it out. First of all, he took a picture of the tooth with the in his smart phone. Secondly, he designed a 3D tooth on the computer  to the picture. After that, he used a 3D printer to print the new one and put it into the mouth of the patient.

    Does it sound interesting? I am sure 3D printing technology will a difference to the world.

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