V3, v4 and redirect to the new folder. Constantly changing the main root location may cause you to lose backlink counts and ranking.
经常改变根目录的位置会导致你丢失反向链接的数量并影响rank值。
As the search engine ranking rules and algorithms are constantly changing, and these rules and algorithms also is a commercial secret, it is impossible to guarantee in a row of several effects.
由于搜索引擎的排名规则及算法是是在不断改变中的，而且这些规则和算法又是商业机密，所以不可能达到保证排在某几位的效果的。
As the search engine ranking rules and algorithms are constantly changing, and these rules and algorithms also is a commercial secret, it is impossible to guarantee in a row of several effects.
由于搜索引擎的排名规则及算法是是在不断改变中的，而且这些规则和算法又是商业机密，所以不可能达到保证排在某几位的效果的。
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