柠檬不该羡慕西瓜
[níng méng bù gāi xiàn mù xī guā]
Lemon and watermelon are two different types of fruits that symbolize various lives, experiences, or characteristics here, meaning individuals should accept and appreciate themselves rather than longing for what they aren’t, or envying someone else's life who is completely different from them, emphasizing self-appreciation and individuality.