此外，进入团购业务领域的门槛也越来越低，这意味着竞争者蜂拥而入时Groupon必须严重依赖品牌营销。

Further, there are few barriers to entry in Groupon's business, which means that it must rely heavily on branding even as competitors pile in. (Meet Groupon's groupies)

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那么，踏进21世纪的门槛，市场营销会出现什么趋势呢？

Then, step into the threshold in the 21st century, what trend will marketing appear?

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