... Baire class of functions 贝尔函数类 There is a special class of functions which is particularly important in economics, namely the class of homogeneous functions. 有一种特殊类型的函数在经济学中特别重要，这就是齐次函数。 Pele was in a class of his own as a footballer. 贝利是举世无双的足球健将。 ...
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