柠檬不懂西瓜的甜西瓜不懂柠檬的酸
        
            [níng méng bù dŏng xī guā de tián xī guā bù dŏng níng méng de suān]
        
        
            It symbolizes incomprehension and lack of empathy, just like lemon cannot experience the sweetness of watermelon and the other way around; different people have completely separate worlds and experiences