Many people believe that Google and Yahoo have already started penalizing web sites that does link exchange in a large scale but we do not know the extend of it.
许多人认为，Google和雅虎已经开始惩罚的网站是否链接交换在大规模的，但我们不知道该延长它。
Many people believe that Google and Yahoo have already started penalizing web sites that does link exchange in a large scale but we do not know the extend of it.
许多人认为，Google和雅虎已经开始惩罚的网站是否链接交换在大规模的，但我们不知道该延长它。
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