为什么服务一个高度忠诚的顾客的成本原则上与服务其他类型的回头客的成本是不同的，这一点完全不清楚。

It is not at all clear why the costs of serving a highly loyal customer should in principle be different from those of serving any other type of repeat customer.

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这就是为什么当兵的互相之间喜欢起些好玩的外号，像“孤城客”或是“大狗”或是“火箭筒小姐”。

That’s why soldiers like to give one another stirring nicknames, like Maverick or Big Dog or Little Miss Bazooka.

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当被报社问及为什么他们在纪念馆里放纵自己时，伦敦客解释说在公共场所小便是“他们的传统之一”。

Asked by the newspaper why they relieved themselves on the monument, Londoners explained that public urination “is a part of their society”.

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