Hotel workers depend on tips to augment their usually small salaries. Rather than being annoyed at having to tip the doorman who greets you, consider it part of the cost of travel and be prepared with the dollar bills you will need to hand out before you even get to your room.
饭店的工作人员主要靠小费来增加他（她）们平时微薄的收入。不要对付给服务员小费感到愤愤不平，而应该把它看作是旅游消费的一部分，并应做好准备在进入饭店之前就随时掏出钞票。

Doormen
Depending on the amount of luggage, tip $ 1 to $ 2 to the doorman who takes your bags and turns them over to a bellman. If you are visiting and have no luggage, you naturally do not tip him for simply opening the door for you. Tip him again when you leave with your luggage as he takes it from the bellman and assists you in loading it in your car or into your taxi. When the doorman obtains a taxi for you, tip him $1 to $3 (the higher amount if he must stand in the rain for a period of time to get it).
门卫
给门卫的小费数目取决于行李的多少，为你拿行李并把它递给行李员的门卫要付给1至2美元的小费。如果你没有行李，通常就不必为他们只为你开门这样简单的服务付费。当你带着行李准备离开饭店而门卫从行李员手中接过行李并帮你把它放入你的车子或出租车里时，你还应该付给他小费。当门卫为你叫了一辆出租车时，你应该付他1至3美元（如果他为了叫辆出租车而不得不在雨中站着时，你的小费应该给得更多些。）
来源:可可英语 http://www.kekenet.com/hangye/201108/146749.shtml