Unit 2 Lesson 3 课件-2022-2023学年山东中职英语第二册第三版

Lesson One Super Typhoon Mangkhut Lesson Two How Light Travels Lesson Three Alexander Bell's Greatest Invention 1 2 3 Unit 2 Nature and Science Alexander Bell's Greatest Invention Nature and Science Unit 2 Lesson three 3 阅读课文，通过小组讨论以及自己的思考，回答问题并填充表格： 1. Where did Alexander Bell invent the telephone? 2. Could you list some Alexander Bell’s inventions, or other inventions you know? Alexander Bell’s Inventions In Chinese In English 1 电话机 telephone 2 光话机 photo phone 3 4 5 Alexander Graham Bell1 was born in Scotland. In 1871, he found a job in the United States. There he made the first telephone in the world. Most people know it was Bell who invented the telephone.2 But not many know about another talking device he invented just four years later, in 1880. He called the device the photo phone. n. 相片/n. 电话，电话机 P47-P48 亚历山大·格雷厄姆·贝尔出生在苏格兰。1871 年，他在美国找到了一份工作。他在那里发明了世界上第一部电话机。 大多数人知道是贝尔发明了电话机。但是，很少有人知道他于4 年后的1880 年发明的另一个被称为“光话机”的通话装置。 “Photo phone” comes from the Greek words for “light” and “sound”. The photo phone did not use electricity to carry sounds over wires between two people. That’s what a telephone does. Instead, the photo phone used a beam of sunlight traveling through the air. With his invention, Bell could actually transmit human speech on a beam of light. “光话机”来源于希腊单词“光”和“声”。电话的工作原理是用电通过电线传播两个人之间的声音，而光话机并不如此。取而代之的是，光话机利用一束光传递两个人之间的声音。通过他的这个发明，贝尔实际上能用一束光来传递人的声音。 To do so, he spoke close to a thin mirror that was reflecting sunlight. The vibrations of his voice caused the mirror to vibrate, and the vibrating mirror caused the light to vibrate. The vibrating light hit a light sensitive cell in a receiver placed some distance away. The cell changed the light patterns into electric signals. Earphones changed the signals back into sounds. 为了做到这一点，他对着一面能反射阳光的薄薄的镜子说话。他声音的振动使镜子也发生振动，振动的镜子又使光发生振动。振动的光撞击放置在一定距离外的接收器中的光敏电池。光敏电池将光的信息变成电信号。耳机又将电信号转换成声音。 Bell believed that his idea of talking on a beam of light would prove to be important. He often