guǎng bō méi tīng qīng, jiù kàn píng mù; píng mù méi kàn qīng, jiù wèn páng biān de rén: xiàn zài jiào dào jǐ hào le

广播没听清，就看屏幕；屏幕没看清，就问旁边的人：“现在叫到几号了？

If you didn't hear the broadcast clearly, look at the screen; if you didn't see the screen clearly, ask the person next to you: 'What number is being called now?'