路上发生了一起意外，所以我迟到了。

Lù shàng fāshēng le yī qǐ yìwài, suǒyǐ wǒ chídào le.

There was an accident on the road, so I was late.

这次见面完全是个意外，我没想到会碰到你。

Zhè cì jiànmiàn wánquán shì gè yìwài, wǒ méi xiǎngdào huì pèng dào nǐ.

This meeting was a complete accident, I didn't expect to run into you.

为了避免意外，开车一定要注意安全。

Wèile bìmiǎn yìwài, kāichē yīdìng yào zhùyì ānquán.

To avoid accidents, you must pay attention to safety when driving.