出售的做价值的百分比改变多少和一哪个方向？
How many per cent did the value of the sales change and a which direction?
但它们确实改变了每用户成本的百分比，多达几个百分点。
However, they do change the percentages of the cost per user by several percentage points.
STATCHANGE：有一个默认值 10，定义阈值改变的百分比。
STATCHANGE: Has a default value of 10, which defines the percentage of threshold changes.
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