In 2007, US marketing firm TerraChoice conducted a survey of products on the shelves of major retail chains.
在2007年美国TerraChoice公司做了一项产品调查，产品主要是连锁零售店货架上的商品。
Through our strong industry experience, we have come to realise that the major retail chains all over the world charge excessive prices for prescription eyewear and sunglasses.
基于丰富的产业经验，我们了解全世界的零售链都对光学眼镜和太阳眼镜收取了过高的差价。
Major retail chains are jumping in too: Apparel giant Gap recently sold $50 gift certificates for $25 on Groupon - shoppers nationwide snapped up 445,000 of them in just 24 hours.
大型零售连锁商家也加入其中：服饰巨头Gap最近在Groupon上以25美元销售价值50美元的礼券，全国范围24小时内就有445,000人抢购。
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