accident incident event affair的用法区别

the July 7th Incident of 1937一九三七年七七(芦沟桥)事变；
border incidents边境事件
Accident: An unexpected, undesirable event；An unforeseen incident accident通常指不愉快的、意外的不测之事，常导致 不良后果。如： A traffic accident happened yesterday，three killed and five wounded.昨天发生了一起交通事故，三死五 伤。 The railway accident was terrible.那次火车车祸是件可 怕的事。 phr. by accident意外地、偶然地：I met her by accident. 我遇见她纯属偶然。 By accident of birth，he was rich.他有幸生在有钱人家。
Event： Something that takes place; an occurrence；A significant
occurrence or happening； A contest or an item in a sports program
既可指历史上的重大事件，国际上的，国内的重大事件， 也可指日常事件，还可表示体育运动的比赛项目。复数形 式指事态的发展或时局： This is the place where all the important events take place. 一切重大的活动都在这儿举行。 Meeting you was quite an event in her life.认识你是她一 生中的一件大事。 The new book was the cultural event of the year.这本新 书的出版是今年文化界的大事。 Which event have you entered for?你参加什么项目? a team event团体赛; a target event射击比赛; field and track events田径比赛
Incident：A usually minor event or condition thபைடு நூலகம்t is subordinate to
another. An occurrence or event that interrupts normal procedure
指与某人或某些重要事件有关的、不太重要的事情或叙述中的 一件事，有时指引起战争，争端的突发事件，可用作battle， war一类词的委婉说法： That was one of the strangest incidents in my life.那是我一生 中最奇怪的事之一。 This is an ordinary incident.这是一件普通的小事。