I've paid this bill twice by mistake. 我弄错了,把这张账单付了两次。
I sent it to Paolo by mistake.
She had shot a rare bird by mistake and had to pay a fine.
He took my phone by mistake.
The letter had been sent to her by mistake.
These are unwanted fish that are caught by mistake.
A number of documents had been destroyed by mistake.
See also: mistake noun