Whenseveralpeoplelookatthesameperson,itisnotunusualfore...
问题详情：Whenseveralpeoplelookatthesameperson,itisnotunusualforeachofthemtoseedifferentthings;whenyouarealoneobservingonebehaviororapersonattwodifferenttimes,youmayseedifferentthings.Thefollowingsarebu...