We've all had that horrible moment of dread when you realise you've sent a text message or an email to the wrong person.

我们都经历过可怕的一刻，意识到把短信和邮件发给了错的人。

The worst occasions are when we don't even realise that we've made the mistake until the recipient brings it to our attention.

最要命的时刻是我们都没意识到我们犯了错，直到收信人引发了我们注意。