yuē rén huò zhǎo dìfang shí, shuō jǐ hào kǒu, bǐ zhǐ shuō dìtiě zhàn qīngchu

约人或找地方时，说几号口，比只说地铁站清楚。

When meeting someone or finding a place, saying which exit number is clearer than just saying the subway station.