程序是由一行行符号序列表达的，空格将符号序列 分为六类： 关键字：include, int, const等说明语句、数据的性质； 标识符：tree，language，a，b等代表运算对象； 运算符：<<, +, ==等表示指定运算； 常量：2.45等，不用说明，是有类型的操作数； 串：“Hello Worls”等用双引号括起来的字符序列； 特殊符号：{, }, //, #, (, )等

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...And during the few moments that we have lef t, we want to have just an off-the-cuff chat between you and me -- us. We want to talk right down to earth in a language that everybody here can easily understand. We all agree tonight, all of the speakers have agreed, that America has a very serious problem. Not only does America have a very serious problem, but our people have a very serious problem

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