柠檬不酸不算柠檬
[níng méng bù suān bù suàn níng méng]
The name translates to 'If it's not sour, it's not a lemon', implying that a true feeling or experience should have some bitterness or challenges, similar to how a lemon is supposed to be tart. It reflects a viewpoint that life without some difficulty lacks authenticity.