有时笑着笑着就哭了有时哭着哭着就笑了
[yŏu shí xiào zhe xiào zhe jiù kū le yŏu shí kū zhe kū zhe jiù xiào le]
Sometimes when you are laughing you suddenly cry, and other times while crying you end up laughing. This reflects the unpredictable nature of emotions, indicating that laughter and tears may come unpredictably and closely together in human life.