可通过组中的索引减少的用户查询的平均成本。
Average cost of the user queries that could be reduced by the index in the group.
而同程旅游CEO吴志祥此前曾表示，出境游交易用户的获客成本在2000元左右，这也是行业平均水平。
The same way travel CEO Wu Zhixiang had previously said that outbound travel transaction users get the cost of about 2000 yuan, which is the industry average.
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