前人空巷后人空街
[qián rén kōng xiàng hòu rén kōng jiē]
'前人空巷后人空街' means ‘empty alleys left by predecessors, empty streets for successors’ signifying generational transitions or a reflection on past versus present; a poetic reminder of time's progression and inevitable change over generations, evoking nostalgia mixed with forward-looking perspectives.