Top website metrics: average page views pervisit, average time on site, booking engine abandonment rate.
最高网站指标:每次访问的平均页面浏览量、网站停留的平均时间、预订引擎放弃率。
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The same sort of thing is happening in health care, another aspect of human capital: middle-class people lead healthier lives than the poor, go to the doctor more often and spend more pervisit.