děng / nǐ / fā / xiàn / wèn / tí / shí / zài / hòu / huǐ / jiù / huǐ / zhī / yǐ / wǎn / le

等你发现问题时，再后悔就悔之已晚了。

By the time you discover the problem, it will be too late to regret it.