杯酒怎眠故人怎挽
[bēi jiŭ zĕn mián gù rén zĕn wăn]
'How can a cup of wine make me sleep; how can an old friend be retained.' This suggests feelings of nostalgia, where drinking cannot quell the memories of friends who have gone. It evokes a melancholy tone of reminiscence and loneliness after friendships have faded.