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1.call on/upon、call at指短暂的、社交性的访问,拜访不认识的人或礼节性的拜访。callon指拜访某人。call at指访问某地。如: The next morning 1 went tocall on Mr.Smith again.第二天我又去拜访了史密斯先生。 I called at his house yes-terday.我昨天到他家探访。 2.call in on常指在前往某处的途中顺便到友人处短暂停留。拜访某人用call in on sb.,拜访某人的家或某地用call in