step 4：研究理解句子，并注意划线部分的具体意义
1.the man who brought technology to the man in the street.(副标题)
2.as a child,sinclair invented the calculator and was saddened to discover that is had already been invented.(p34 l5-6)
3. sinclair was blessed with brains and spent much of his time educating himself.(p34 l6-7)
4.▲by the time he was ten years old, his teachers said that he was already so good at geometry, algebra and arithmetic that they could not teach him any more maths.(p34 l7-9)
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