由于这些网站为用户提供免费服务，有的网站只能靠其他网店投放的广告费来赚钱，而这些通常只够支付网站的基本运营费用。
Since they provide a free service to those users, some sites make money only through advertisements posted by other online stores, and that is often just enough to offset its basic costs.
由于这些网站为用户提供免费服务，有的网站只能靠其他网店投放的广告费来赚钱，而这些通常只够支付网站的基本运营费用。
Since they provide a free service to those users, some sites make money only through advertisements posted by other online stores, and that is often just enough to offset its basic costs.
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