据说，给服务员、出租车司机、理发师及门卫等支付小费是一种礼貌的行为。
It's said to be good manners to tip your waiter, taxi driver, hairdresser, doorman and so on.
许多人不厌其烦地向女佣、门卫或停车场服务员问好。
Many people do not bother to say hello to the maid, janitor, or parking attendant.
即使是非常优秀的销售员，门卫都会让他们非常头疼，所以很多时候他们会直接放弃。
The difficulty in getting past gate keepers is so frustrating that many times good salespeople just give up.
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