悔之晚矣 Too late to regret
Explanation
指后悔已经晚了。表达了对过去行为的懊悔之情，也提醒人们要珍惜机会，及时把握。
It means it's too late to regret. It expresses regret for past actions and reminds people to cherish opportunities and seize them in time.
Origin Story
从前，有个年轻人名叫小李，他从小就贪玩，不爱学习。长大后，他发现自己比同龄人落后很多，找不到好工作，生活困苦。他后悔当初没有努力学习，但一切都已经太晚了。他只能默默承受生活的压力，心中充满悔恨。这个故事告诉我们，时间宝贵，要珍惜现在，不要等到失去机会才后悔莫及。
Once upon a time, there was a young man named Xiao Li, who was playful and disliked studying since childhood. When he grew up, he found that he was far behind his peers, couldn't find a good job, and lived a hard life. He regretted not studying hard when he was young, but everything was already too late. He could only silently endure the pressure of life, filled with regret. This story tells us that time is precious, we should cherish the present, and not wait until we lose the opportunity to regret.
Usage
通常作谓语、宾语、状语。表示事情已经无法挽回，只能后悔。
Usually used as predicate, object, or adverbial. It means that things cannot be reversed, and one can only regret.
Examples
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他当初没有好好学习，现在后悔已经晚了。
tā dāngchū méiyǒu hǎohǎo xuéxí, xiànzài huǐ zhī wǎn yǐ le
He didn't study hard when he was young, now it's too late to regret.
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机会错过了，悔之晚矣！
jīhuì cuòguò le, huǐ zhī wǎn yǐ
The chance is missed, it's too late to regret!