After all, writing your own Web-accessible commerce system has limited competitive advantage and potential additional costs.
毕竟，自己编写Web访问的商业系统没什么竞争优势，而且可能会增加成本。
For the media, just as for other industries, genuine competitive advantage comes from limited sources.
就象其他行业一样，媒体业真正的竞争优势只有屈指可数的几个来源。
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