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;
延迟delay/procrastinate;
转瞬即逝in a blink of an eye;
千载难逢once in a blue moon
