chí dào shí shuō liǎng fēn zhōng dào yǐ jīng xià lóu bǐ zhǐ shuō mǎ shàng gèng qīng chǔ

迟到时说“两分钟到”“已经下楼”，比只说“马上”更清楚。

When you're late, saying 'I'll be there in two minutes' or 'I've already gone downstairs' is clearer than just saying 'soon.'