xiǎozǔ zuòyè zuìhǎo yǒu nèibù jiézhǐ shíjiān bǐ zhèngshì jiézhǐ zǎo yīdiǎn

小组作业最好有内部截止时间，比正式截止早一点。

It's best for group projects to have an internal deadline that is slightly earlier than the official one.