by mistake

1.She sprayed hair spray in her eye by mistake.

洗头水当成眼药水上到眼睛里了。

2.She let the news slip by mistake, in an unguarded moment.

一不留神泄漏了消息。

3.Be careful that you don't set the fireworks off by mistake.

当心点, 别弄了引起那些爆竹爆炸。

4.He made this mistake by accident.

他犯这个纯属偶然。

5.I locked him in by mistake.

我他锁在屋里了。

6.He took his neighbour's raincoats by mistake, so he hung them back outside.

他收了邻居家的雨衣, 于是又它们挂回原处。