incident,accident,event,affair 和 business的用法区别?

incident,accident,event,affair 和 business的用法区别? accident,incident,event的区别 incident,accident和event有什么区别 accident event afffair incident 的区别 incident,occurrence,event,accident的区别 affair business event matter thing 的区别 event. case, incident, affair 四个词的区别 affair和event的区别? incident和event的区别 affair event incident有什么区别 单词 emergency 、accident、event、affair、incident 都解释为事件,那他们的词性、区 accident和incident的区别?