西瓜不懂柠檬酸芒果不知薄荷凉
[xī guā bù dŏng níng méng suān máng guŏ bù zhī bó hé liáng]
This phrase plays with the innocence and lack of understanding between different things, like how watermelons do not know the sourness of lemons and mangoes do not feel the coolness of mint. It could metaphorically describe how some experiences remain foreign or misunderstood to certain people, emphasizing the uniqueness and differences in individual experiences.