旧时光是一道暗伤
[jiù shí guāng shì yī dào àn shāng]
'The Past Time Is A Hidden Wound' implies that past experiences or memories are like hidden wounds deep inside the heart. The good and bad memories in those bygone days remain in the depths of memory and may still affect the current emotions and attitudes towards life, especially when triggered by similar situations. These 'old times' could symbolize both beautiful, cherished moments as well as painful and regretful episodes.