对话原文+翻译:
Ella: Hi, Han Lin! Did you go to the International Exhibition of Inventions last weekend?
埃拉：嗨，韩林！上周末你去国际发明展览会了吗？
Han Lin: Yes, some amazing inventions were shown from all over the world.
韩林：去了，展会上展出了世界各地一些令人惊叹的发明。
Ella: What invention did you like the most?
埃拉：你最喜欢哪一项发明？
Han Lin: Oh, the 3D printer was amazing.
韩林：哦，3D打印机太厉害了。
Ella: Why?
埃拉：为什么？
Han Lin: Almost everything under the sun can be made by it.
韩林：几乎世间万物都能用它制作出来。
Ella: Really? Like what?
埃拉：真的吗？比如什么？
Han Lin: Well, all kinds of everyday objects. Toys, chairs, tables, and even houses can all be made by the 3D printer.
韩林：各种各样的日常物品。玩具、椅子、桌子，甚至房子都可以用3D打印机打印出来。
Ella: That’s cool!
埃拉：太酷了！
Han Lin: Yeah. And in medicine, for example, arms and legs, and even hearts can be created by the 3D printer.
韩林：是的。比如在医学领域，四肢，甚至心脏都可以由3D打印机制造。
Ella: That’s great! How does it work?
埃拉：太棒了！它是怎么工作的？
Han Lin: Well, first, the object is designed on a computer. Then, a file is created and sent
韩林：首先，在电脑上设计物品。然后生成文件并发送（给打印机）
to the 3D printer. The 3D printer reads the file, and after that, the object is produced by building up plastic.
（文件发送）到3D打印机。3D打印机读取文件，之后通过逐层堆叠塑料，打印出物品。
Ella: Is only plastic used?
埃拉：只能用塑料吗？
Han Lin: No, other materials can also be used to produce things. It can even make food.
韩林：不是的，也可以用其他材料来制作物品。它甚至能打印食物。
Ella: Oh, really? I’d love to try 3D-printed food!
埃拉：哦，真的吗？我好想尝尝3D打印食物！
重点单词&短语
1. exhibition /ˌeksɪˈbɪʃn/ n. 展览会
2. 3D printer 3D打印机
3. under the sun 世上，世间
4. everyday objects 日常物品
5. design /dɪˈzaɪn/ v. 设计
6. file /faɪl/ n. 文件
7.build up 逐步堆叠，层层构建
8.material /məˈtɪəriəl/ n. 材料
9.produce /prəˈdjuːs/ v. 制造，生产
10.3D-printed adj. 3D打印的
简答参考：
Q: What can a 3D printer make?
A: It can make all kinds of everyday objects such as toys, chairs and houses. It can also create body parts like arms, legs and hearts for medical use.
Q: What’s the first step to use a 3D printer?
A: We design the object on a computer first.
Q：Is plastic the only material for the 3D printer?
A：No. Other materials can also be used, and it can even make food.
