by accident, in a way that is not planned or intended

偶然，意外地;

I met her quite by accident (=completely by accident) .

我遇见她完全是偶然。

The discovery was made almost by accident.

这几乎是意外发现。

The pilot, whether by accident or design (=whether it was planned or not planned), made the plane do a sharp turn.

不知是有意还是无意，那名飞行员让飞机来了个急转弯。

[C] a crash involving cars, trains, planes etc

交通事故; 车祸; 失事:

Over 70,000 people are killed or seriously injured every year in road accidents.

每年在道路事故中丧生或受重伤的有七万多人。

a fatal accident on the freeway

高速公路上的一宗致命交通事故

The accident happened at the junction of Forest Road and Pine Walk.

事故发生在森林路与松树路的交叉口。

[C] a situation in which someone is injured or something is damaged without anyone intending them to be

事故，意外事件:

Ken had an accident at work and had to go to hospital.

肯在工作中出了事故，不得不去医院。

I'm sorry about breaking the vase – it was an accident (=I did not intend to do it) .

对不起，我把花瓶打碎了 — 这是个意外。

[C,U] something that happens without anyone planning or intending it

意外事件:

My third baby was an accident.

我的第三个孩子是意外怀上的。

It is no accident that men fill most of the top jobs in nursing, while women remain on the lower grades.

男性在护理行业中占据了大多数的重要职位，而女性仍处于较低级别，这并非偶然。

accidents (will) happen, [spoken] used to tell someone who has broken something that they should not worry that it has happened

意外事情在所难免，不小心总是有的

an accident waiting to happen, used about a situation in which an accident is likely to happen because no one is trying to prevent it

肯定会出的事故:

The boats are being left to drift; it's an accident waiting to happen.

任由这些船漂流，肯定会出事的。