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

　　Seize the day.把握今天;

　　Time and tide wait for no man. 时光不等人;

　　How time flies!光阴似箭;

　　indulges in reminiscences of 沉溺于对...的回忆;

　　recollect past experiences or events缅怀过去经历和事件;

　　contemplate the future思考将来