This private data has become a constant source of handsome profits because several companies, including Internet giants, are imbedding more sophisticated software to follow and collect user information.
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Yet internet-only e-tailers such as Amazon are also facing stiffer competition from bricks-and-mortar stores improving their own online offers, including supermarket giants such as Wal-Mart.
然而，像亚马逊那样只依靠网络进行交易的零售商们正面临来自从事非网络交易的传统商店的更为激烈的竞争，包括像沃尔玛这样的超市巨头等传统商店都在改进其网上销售方式。
Sina's entry into China's online luxury market poses a challenge to other Internet giants, including Netease and Tencent.
新浪进军中国网上奢侈品市场令其他互联网巨擘如网易和腾讯面临挑战。
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