behindhandadj.adv.prep.落后的,耽误的laggardadj.缓慢的迟缓的,落后的n.落后者fallbehindTofailtokeepupapace;lagbehind.落后：跟不上步伐；落后Tobefinanciallyinarrears.拖欠：经济上欠款fallbehindinv.在...方面落后。