柠檬不该嫌西瓜的甜西瓜不该嫌柠檬的酸
[níng méng bù gāi xián xī guā de tián xī guā bù gāi xián níng méng de suān]
The literal meaning is 'Lemon shouldn't complain about watermelon being too sweet, watermelon shouldn't complain about lemon being too sour.' It indicates that everyone (or everything) has its own unique qualities. People should cherish and respect these differences rather than complain or feel discontent about the strengths of others. This also implies mutual understanding and harmony.