1.accident有两个常见含义:

1）,意外事故(something unpleasant, undesirable，or damaging),如 ：

traffic accident(交通事故),car accident(车祸)。

I had an accident when I was driving to work - my car hit a tree.

我开车上班时出了事故--我的汽车撞在树上了。

There has been a road accident.

发生了一起交通事故。

2）. 偶然发生的事(可以是好事,也可以是坏事)。

The discovery was a happy accident.

这一发现是一个令人高兴的意外。

Your meeting us was a mere accident.

你和我们见面只是个意外。

It was just an accident that I found the missing letter.(好事)

我找到了那封丢失了的信,完全是偶然的。

I'm sorry I broke your watch-it was an accident.(坏事)。

对不起,我把你的手表弄坏一--不是存心的。

2.incident 则是指“不好的或异乎寻常的事件”,可能是大事件,也可能是小事件。

发生的事情(尤指不寻常的或讨厌的)；(两国间的)摩擦，冲突；严重事件，暴力事件(如犯罪、事故、袭击等)；(常指)军事冲突

The incident has received wide coverage in the press.

这个事件已被新闻界广泛报道。

The incident had shaken her faith in him.

这件事动摇了她对他的信心。

The incident was used as a pretext for intervention in the area.

这次事件成了干涉那个地区的借口。

This latest incident could derail the peace process.

最近这个事件可能会扰乱和平进程。

The borders incident is worthy of special attention.

边境事件值得特别关注。

These incidents were the latest in a series of disputes between the two nations.

这些事件是两国一系列争端中最近发生的几起。

There was a shooting incident near here last night.

昨夜这附近发生了枪击事件。

Last night police staged a reconstruction of the incident.

昨天晚上，警方演出了再现事故经过的场景。

The incident brought the problem of violence in schools into sharp focus.

这次事件使校园暴力成为焦点问题。

The incident caused a great deal of political mischief.

这一事件造成了严重的政治危害。

Police have appealed for anyone who witnessed the incident to contact them.

警方呼吁目击这一事件的人与他们联系。

She gave the police a full account of the incident.

她向警方详尽地叙述了所发生的事情。

The incident didn't even rate a mention in the press.

这件事在报纸上连提都不值得一提。

The incident sparked off a whole series of events that nobody had foreseen.

那一事件引发出一连串谁都没有料到的事。

The media have blown the incident up out of all proportion.

媒体大肆渲染这件事。

The incident cast doubt on her motives and reliability.

这件事使人怀疑她有何动机，以及她是否可靠。

This incident coloured her whole life.

这事件影响了她的一生。

She denied all knowledge of the incident.

她矢口否认知晓此事的任何情况。

The movie is based on a real-life incident.

这部电影以现实生活中的一件事为基础。

We need to know the exact time the incident occurred.

我们需要了解事情发生的确切时间。

The demonstration passed off without incident .

这次示威平静地结束了。

Josie told us about a funny incident at school, when her teacher fell in the pond!

乔西告诉我们一件学校里可笑的事,她的老师掉进池塘里了。

There was a strange incident in the supermarket today.

今天,超级市场里发生了一件怪事。

The July 7th Incident of 1937 is an important one in the history of China.

1937 年的七七事变是中国历史上的一件大事。

3.event则是指“重大的历史事件”或日常生活中的重要事件,

事件；(尤指)重要事情，大事:

social/sportingevent 社会重大事件/体育比赛

Hong Kong's returm to China is one of the chief events of1997.

香港回归中国是1997 年的大事之一。

That night a terrible event occurred.

那天夜里发生了一件可怕的事。

The election was the main event of 2024.

那次选举是2024年的主要大事。

In the light of later events the decision was proved right.

从后来发生的事看，这一决定证明是正确的。

At that time I was ignorant of events going on elsewhere.

那时我并不了解其他地方发生的事情。

It was an event that would transform my life.

那是能够彻底改变我一生的一件事。

The event is bound to attract wide press coverage.

这个事件一定会在各报刊广泛报道。

These events are history in the making.

这些事将载入史册。

These events changed the course of history.

这些事件改变了历史的进程。

The government is keen to put some distance between itself and these events.

政府急于想表示自己与这些事件无关。

mishap n. 小事故

指影响不大的小事故或小错误。

He was upset by a series of mishaps.

一连串的倒霉事弄得他很心烦。

She had a slight mishap with the expensive vase.

她把那个贵重的花瓶弄坏了一点儿。

occurrence n. 事件

指生活中发生的一般的或偶然的事件。

Traffic jams are a common occurrence in that area.

那一地区常常堵车。

Extreme weather is a rare occurrence in that country.

那个国家不常出现极端天气。