Most observers think the lower-tier markets will be saturated within five years.
多数观察人士认为,二、三线城市市场将在5年内达到饱和。
In fact, some firms do not know who is supplying their suppliers-or even where some of their lower-tier suppliers are based.
事实上,有些公司并不清楚谁在为自己的供应商提供服务-或者甚至连自己的底层供应商的总部在哪里也不知道。
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