你一转身流年已苍蓦然回首灯火阑珊
[nĭ yī zhuăn shēn liú nián yĭ cāng mò rán huí shŏu dēng huŏ lán shān]
'Time Changes When You Turn Around; Suddenly Looking Back, the Lights Are Dim' implies nostalgia, expressing that once time has passed, memories are hard to relive and only remain as vague reminiscences.