如今二十二岁的他第二次站在TED的讲台上，向我们讲述发明改变生活的感人故事。
Now at 22, William Kamkwamba, who speaks at TED, here, for the second time, shares in his own words the moving tale of invention that changed his life.
飞机的发明改变了我们的生活。
13岁时，我发明了一种改变我生活的东西。
At the age of 13, I invented something that changed my life.
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