摘要
It's every traveler's nightmare.The porter brings you bags to your room and helpfully explains how to access CNN.He shows you how to turn om the lights and adjust the air-conditioner.Then he points to thephone and says"if there's anything else you need,just call".Ahll this time ,you've been thing one thing."How much should tip this guy?"Out of desperation you shove a few banknotes into his hand,hoping that you're neither given too much or too little.
