他对自己的决定感到深深的悔恨。

Tā duì zìjǐ de juédìng gǎndào shēn shēn de huǐhèn.

He deeply regrets his decision.

错过这次机会是我一生的悔恨。

Cuòguò zhè cì jīhuì shì wǒ yīshēng de huǐhèn.

Missing this opportunity is a lifelong regret for me.

与其事后悔恨，不如现在就认真面对问题。

Yǔqí shìhòu huǐhèn, bùrú xiànzài jiù rènzhēn miànduì wèntí.

Rather than regretting it later, it’s better to face the problem seriously right now.