社会媒体的分销与使用与传统的网站零售和营销有很大的差别，希望进行注册，然后期待交易就会到来的方法注定不会成功。
Social media distribution and usage is vastly different to traditional web retail and marketing.
这里介绍的技巧用于处理其中的一个情况：一个为“零”的数组和一个没有元素的数组之间的差别。
This tip addresses one of those cases: the distinction between an array which is null, and an array which has no elements.
原因是：零售商们身处品牌差别化的全面竞争中，要从其他的竞争者中脱颖而出成为唯一的商店品牌身份，同时他们需要相应厂商的帮助。
The reason: retailers are in an all-out war to differentiate their brands—as unique store identities—from their competitors and they are demanding help from specific vendors.
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