中学生优秀即兴英语演讲稿

　　In the early nineteenth century, people began to use gas (gaslight), butthe gas pipeline supply by a leak or blockage, very easy to have an accident,people for illumination of reform, very ardent.In fact, Edison for himself setthe mission impossible: in addition to improve lighting, but also of ThomasEdison electric light Create a set of power supply system.And he and the dreamLuoYuan buddies, sleepless do 1600 repeatedly heat-resistant material and morethan 600 plant fiber experiment, only produced the first carbon wire bulb, can aburning 45 hours.Later he more on this basis, the method of continuousimprovement manufacture can ignite 12 hours finally came out with the ZhuSibulbs.The 19th century the 1980s, Edison electric light career succeeded, thissuccess than any previous achievements brought him reputation.In the 1980s,before he had little mistake, intermediate later, although he has made greatachievements, but also common occurance of failure.Edison's most not commendableactions is one of his criticism alternating current, say it has side effects,likely cause of death and injury, but he did not add details.So somebody said,"as he such a mess out many inventions that people about others' new inventionsaurday attack, this is very contradictory things." He opposes the use ofalternating current and direct current, so the approve a fierce debate andstubborn in failure.In this respect, reflects the Edison became a celebrityafter the stubbornness of started to foster old-fashioned shortcomings.