Definition
As a result of an error or a lack of attention; unintentionally.
不小心；无意中
I spilled coffee on your report by mistake.
我不小心把咖啡洒在你的报告上。
She put salt in the cake by mistake instead of sugar.
她不小心把盐当成糖放进了蛋糕里。
He deleted the important emails by mistake.
他不小心删除了重要的电子邮件。