檢討

我在校慶後打掃的時候弄掉了一把學校的鑰匙，我被迫寫了一份檢討。

wǒ zài xiàoqìng hòu dǎsǎo de shíhou nòng diào le yì bǎ xuéxiào de yàoshi wǒ bèipò xiě le yí fèn jiǎntǎo

I lost a school key when I was cleaning up after the school festival and I was then required to write an apology letter.