shì / qíng / yǐ / jīng / wú / fǎ / wǎn / huí / tā / zhǐ / néng / dú / zì / jiē / huǐ

事情已经无法挽回，他只能独自嗟悔。

There was no way to undo what had happened, so he could only regret it alone.