珍惜:cherish/treasure

　　把握:seize

　　回忆:recall/recollect/reminisce

　　怀旧:nostalgia

　　纪念:in memory of/commemorate

　　虚度:waste/loiter/squander/idle away

　　流逝:time flies/ wear away

　　延迟:delay/procrastinate

　　转瞬即逝:in a blink of an eye

　　千载难逢:once in a blue moon