yuē rén zài dì tiě zhàn jiàn miàn shí shuō qīng jǐ hào kǒu zhàn nèi hái shì zhàn wài

约人在地铁站见面时，说清几号口、站内还是站外。

When meeting someone at a subway station, be clear about which exit number, inside or outside the station.