线下交易指非正常模式下的交易，线下交易是指不通过安全中介购买物品，由买卖双方自行交易。
当时，这桩交易被认为是新浪向线下广告扩张的一个高风险举措。新浪拥有中国最大的门户网站。
At the time the deal was considered a risky move by Sina, the owner of China's largest Internet portal, to expand into offline advertising.
通常情况下交易线下进行的确切方式并非如此。
That's not exactly the way business normally goes down offline.
这些二手书店精心收藏的珍本和绝版书籍，由于受到网络旧书交易的竞争和巴黎人阅读及购物习惯的改变，销售额直线下降。
Bouquinistes' sales have dived as their carefully collected stocks of rare and out-of-print books face competition from online dealers and a change in Parisians' reading and shopping habits.
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