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Welcome to the Voice of America's News Words.
欢迎收看美国之音：新闻词汇。
Martin Cooper invented the world's first mobile phone in 1973.
1973年，马丁·库珀发明了世界上第一部手机。
Optimist
乐观主义者
Fifty years later, Cooper speaks of his hopes and worries about mobile technology.
50年后，库珀谈到了他对移动技术的希望和担忧。
He worries about human dependence on the internet.
他担心人类对互联网的依赖。
But Cooper describes himself as an optimist.
但库珀称自己是一个乐观主义者。
He hopes the technology will change human lives for the better, especially in education.
他希望这项技术将会使人类的生活变得更好，尤其是在教育方面。
An optimist is someone who believes that good things will happen.
乐观主义者是相信好事会发生的人。
They are hopeful about the future.
他们对未来充满希望。
The opposite of an optimist is a pessimist.
与乐观主义者相反的是悲观主义者。
