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<正> 1.visit 是正式用语,常用来表示时间较长的访问,也指友好访问,但一般多用于医生、工作人员等因公所做的访问。如:When we were in London.we visited the Tower twice.我们在伦敦时曾两次参观伦敦塔。The doctor visits his patients at their homes at regular intervals.那医生定期到病人家出诊。2.tall on(or upon),tall at 指社交性访问,拜访不认识的人或礼