影響力字彙 （MP3）

　　全書中英對照，由28篇具影響力的發明人物故事，
　　見證劃時代的發明，保證你的字彙POWER無限晉級！

　　★規劃四大篇章【飲食民生】、【歷史懷舊】、【現代科技】和【資訊知識】
　　
　　從撼動人心的人物故事、具影響力的發明物品中累積無限飆升的英語力。

　　發明物品如蒸汽引擎(Steam Engine)、膠捲底片(Roll Film)、可樂(Coke)、花生醬(Peanut Butter)、牛仔褲(Jeans)、飛機(Airplane)、直升機(Helicopter)、電話(Telephone)和臉書(Facebook)等，發明影響我們生活甚鉅，由最貼近生活層面、最能勾起人們回憶的篇章，精選各發明人物故事，從『聽』、『讀』故事中記憶單字，雙管齊下背誦字彙。

　　★從發明家人物身上偷師，提升自我表達能力與翻譯能力

　　英文寫作無限飆升，邁向成功之路！！！

　　收錄28位發明家，從閱讀發明家介紹跟敘述，了解其背景，他們的學習精神、人格特質以及邁向成功道路中所作的努力，並學習以英文描述人物，從中提升英文翻譯和表達能力。

　　★從精選28回試題演練，檢視學習成效，成就卓越英語學習！！！

　　不只背單字，更要知道怎麼活用！從試題中檢視閱讀發明人物故事後，是否掌握實用的關鍵單字，並藉由試題解析了解自己的閱讀盲點。再遇到同類型的題目時，就能更游刃有餘！

作者簡介

洪婉婷
 
　　美國聖荷西州立大學經濟碩士
　　日本東海大學
　　政治經濟學部經營學士
　　曾任職日商駐美辦事處
　　高階主管9年
　　多年英語教學經驗
 
　　【著作】國貿與新多益一魚兩吃

Unit 19
 
19-1 Helicopter by Igor Sikorsky
 
Helicopter
 
Different from an airplane, a helicopter relies on rotors to take off and land vertically, to hover, and to fly forward backward and laterally. Because of its flexibility, it allows taking off and landing at limited areas. Therefore, helicopters are often used for rescues or ironically wars.
 
The earliest reference for vertical flight originated from bamboo copter  developed in 400 BC. The theory of the bamboo copter is to spin the stick attached to a rotor. The spinning creates lift, and the toy flies when released.  This is the origin of the helicopter development which scientists all over the world spent hundreds of years developing so that we can have helicopter today.
 
About a thousand years later, Leonardo da Vinci created a design that was made towards vertical flight called “aerial screw”. Another 300 years later, Russian scientist Mikhail Lomonosov developed a small coaxial modeled and demonstrated it to the Russian Academy. It was another 100 years later, in 1861, the word “helicopter” was named by a French inventor, Gustave de Ponton dAmecourt, who made a small, steam powered helicopter made with aluminum, although this model never lifted off the ground.
 
Since then, helicopter development was going on all over the world. From the United States, to England, France, Denmark and even Russia. But it was not until 1942 that a helicopter designed by Igor Sikorsky reached a full-scale production. The most common helicopter configuration had a single main rotor with anti-torque tail rotor, unlike the earlier designs that had multiple rotor.
 
Centuries of development later, the invention of helicopter improves the transportation of people and cargo, uses for military, construction, firefighting, research, rescue, medical transport, and many others. The contributions are uncountable.