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n 落后，延遲，相隔時間(act，state or amount of time of being slower，later)[C]：Bad weather caused a～in the scheduled activities. 天氣不好延誤了安排好的活動。cultural～文化滯后;jet～時差反應;a time～of two months 遲兩個月的時間;the～of the tide 潮時差;a～of several seconds between the lightning and the thunder 閃電與雷聲之間幾秒鐘的時間差;〖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～.一些賽跑選手開始落后了。～behind other countries in space exploration 在宇宙空間探索方面落后于其他國家;Interest～s in such matters.對這類事情的興趣慢慢地減少了。The lame child～ged far behind. 那個跛腳的孩子遠遠地落在后面?！纪絫rail;〖反〗 lead