能实现词频统计，实现读入英文，并计算出现频率！！！！！！！能实现词频统计，实现读入英文，并计算出现频率-To achieve word frequency statistics, the realization of reading in English, and calculate the frequency! ! ! ! ! ! ! To achieve word frequency statistics, the realization of reading in English, and calculate the frequency! ! ! ! ! ! !