3D打印机的英语作文
3D printing or Additive manufacturing is a process of making a three-dimensional solid object of virtually any shape from a digital model. 3D printing is achieved using an additive process, where successive layers of material are laid down in different shapes. 3D printing is also considered distinct from traditional machining techniques, which mostly rely on the removal of material by methods such as cutting or drilling (subtractive processes).A 3D printer is a limited type of industrial robot that is capable of carrying out an additive process under computer control.While 3D printing technology has been around since the 1980s, it was not until the early 2010s that the printers became widely available commercially. The first working 3D printer was created in 1984 by Chuck Hull of 3D Systems Corp. Since the start of the 21st century there has been a large growth in the sales of these machines, and their price has dropped substantially. According to Wohlers Associates, a consultancy, the market for 3D printers and services was worth $2.2 billion worldwide in 2012, up 29% from 2011.The 3D printing technology is used for both prototyping and distributed manufacturing with applications in architecture, construction (AEC), industrial design, automotive, aerospace, military, engineering, dental and medical industries, biotech (human tissue replacement), fashion, footwear, jewelry, eyewear, education, geographic information systems, food, and many other fields. One study has found that open source 3D printing could become a mass market item because domestic 3D printers can offset their capital costs by enabling consumers to avoid costs associated with purchasing common household objects.
关于3d打印机的利与弊的英语作文怎么写
《3D打印技术讲座》观后感上个星期六我参加了一个讲座——《3D打印技术讲座》。
通过这个讲座的学习，从中让我学到了很多，同时也让我感触多多，现在我简单介绍一下3D打印技术。
3D 打印技术即：三维打印（英语：3D printing），即快速成形技的一种，它是一种数字模型文件为基础，运用粉末状金属或塑料等可粘合材料，通过逐层打印的方式来构造物体的技术。
过去其常在模具制造、工业设计等领域被用于制造模型，现正逐渐用于一些产品的直接制造。
特别是一些高价值应用（比如髋关节或牙齿，或一些飞机零部件）已经有使用这种技术打印而成的零部件。
“三维打印”意味着这项技术的普及。
早期的三维打印的例子发生在 20 世纪 80 年代，虽然那时的三维打印机是大型的，昂贵的，所能制造的产品可能非常有限。
在 1980 年代，热溶解积压成形 (Fused Deposition Modeling ， FDM) 技术由 S. Scott Crump 开发成功，并在 1990 年代商业化。
在 1980 年代中期，被在美国德州大学奥斯汀分校的卡尔 Deckard 博士开发出来并获得专利，目由 DARPA 赞助的 1979 年，类似过程由 RF Housholder 得到专利，没有被商业化。
在 1987 年， Chuck Hull 发明的 Stereolithography(立体光刻工艺)被授予了专利。
三维打印的设计过程是：先通过计算机辅助设计（CAD）或计算机动画建模软件建模，再将建成的三维模型“分区”成逐层的截面，从而指导打印机逐层打印。
设计软件和打印机之间协作的标准文件格式是 STL 文件格式。
一个 STL 文件使用三角面来近似模拟物体的表面。
三角面越小其生成的表面分辨率越高。
PLY 是一种通过扫描产生的三维文件的扫描器，其生成的VRML 或者 WRL 文件经常被用作全彩打印的输入文件。
目前三维打印机的分辨率对大多数应用来说已经足够（在弯曲的品可以通过如下方法：先用当前的三维打印机打出稍大一点的物体，再稍经过表面打磨即可得到表面光滑的“高分辨率”物品。
有些技术可以同时使用多种材料进行打印。
有些技术在打印的过程中还会用到支撑物，比如在打印出一些有倒挂状的物体时就需要用到一些易于除去的东西（如可溶的东西）作为支撑物。
奥迪公司（Audi）使用快速成型技术的 KUKA 机器人来制造的 Audi RSQ 汽车许多相互竞争的技术是可用的。
它们的不同之处在于以不同层构建创建部件，并且以可用的材料的方式。
一些方法利用熔化或软化可塑性材料的方法来制造打印的“墨水”，例如：选择性激光烧结（selective laser sintering，SLS）和混合沉积建模（fused deposition modeling，FDM），还有一些技术是用液体材料作为打印的“墨水”的，例如：立体平板印刷（stereolithography，SLA）、分层实体制造（laminated object manufacturing，LOM）现在随着时代的发展越来越多国家认为3D打印技术是第3次工业发展标志，所以作为大学生的我们更应该抓住这次机会，多多学习抓住这个机遇
英语作文3d食品打印机目的和优点
e is a reading room and a library here. Every evening many villagers go to the
3d食物打印机的好处 60词英语作文
3D打印技术就是将计算机中设计的三维模型分层，得到许多二维平面图形，再利用各种材质的粉末或熔融的塑料逐层打印这些二维图形堆叠成为三维实体。
所以3D打印技术包括了三维模型的建模、机械及其自动控制（机电一体化）、模型分层并转化为打印指令代码软件等技术。
学习三D打印技术主要就是学习以上几个方面的内容。
至于你所提后面的问题各个地区不同不便于具体回答。
据我所知，现在学习这方面技术有两类人：一部分是研究机构的研究人员，还有一部分是爱好者。
专门的培训机构还比较少见。
电视的优缺点英语作文带翻译
Advantages And Disadvantages Of TVNowadays TV is very important in our daily life. We can get to know all kinds of news and information around the world. We can learn the knowledge in connection with the weather, history, astronomy, geography, laws, medicines, etc. After doing some tiresome work for a whole day, we can watch some funny programs to get ourselves relaxed. In the evening almost all the families in Chinaturn on their TV sets to watch the news or other programs. It would be inconceivable if there were no TV in our daily life. While we enjoy the benifits the TV has brought us, we need to know the negative sides of the TV Programs. Neglecting their studies, some younsters often watch interesting TV programs deep into the night, which has not only influenced their studies but has bad influence on their health. Watching TV for too long a time, it will hurt their eyes. While sitting in front of TV for a long time without moving, it will slow down one’s blood circulation and hence it will cause health trouble. What is more some frightening programs are not suitable for children to watch. Therefore we should choose the programs suitable for people with different ages to watch at the appropriate time. After sitting in front of the TV for a long time, we need to stand up to do some exercises so that our eyes will not get hurt. So we should make good use of TV and let it play an active part in our daily life, and eliminate its negative sides to our health and work.
