n 落后，延迟，相隔时间(act，state or amount of time of being slower，later)[C]：Bad weather caused a～in the scheduled activities. 天气不好延误了安排好的活动。cultural～文化滞后;jet～时差反应;a time～of two months 迟两个月的时间;the～of the tide 潮时差;a～of several seconds between the lightning and the thunder 闪电与雷声之间几秒钟的时间差;〖同〗 delay;〖反〗 advance;

vi 落后(be or fall behind in time，development or progress)[I，I+prep(behind)，I+adv(behind)]：Some of the runners in the race began to～.一些赛跑选手开始落后了。～behind other countries in space exploration 在宇宙空间探索方面落后于其他国家;Interest～s in such matters.对这类事情的兴趣慢慢地减少了。The lame child～ged far behind. 那个跛脚的孩子远远地落在后面。〖同〗trail;〖反〗 lead