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不分类的长尾词已保存到 longtail_keywords.txt 文件中，更换其他关键词继续追加写入，重复的和小于6个汉字的会被跳过.

分类的长尾词保存到以下对应的文件

Array
(
    [1] => k-paodao.txt
    [2] => k-lanqiuchang.txt
    [3] => k-wangqiuchang.txt
    [4] => k-zuqiuchang.txt
    [5] => k-weiwang.txt
    [6] => k-pinzhuangdiban.txt
    [7] => k-epdm.txt
    [8] => k-lanqiujia.txt
    [9] => k-taocikeli.txt
    [10] => k-mudiban.txt
    [11] => k-pikeqiu.txt
    [12] => k-qita.txt
)