不是每段心酸都可以当笑谈
[bù shì mĕi duàn xīn suān dōu kĕ yĭ dāng xiào tán]
'Not all heartbreak can be made light as casual talk' – highlighting a more mature outlook, indicating there's an unspeakable sadness deep within. This kind of experience cannot be easily forgotten, and may even become part of oneself.