fall behindna.落后;跟不上;落下;拖欠落在后面;落后于;掉队例句1.They fall behind by an average of over two months in their reading.他们落后平均超过两个月的阅读量。2.My math is relatively weak. and I will try my best not to let myself fall behind this term.我的数学弱一些。本学期我要竭尽全力不使自己落后。3.The existing and public service facilities fall behind, the service and the management works do not arrive.现有公共服务设施落后,服务与管理工作不到位。4.I make it a rule to read the newspaper every day lest I shall fall behind the times.我每天读报纸已成为一个惯例,以免落伍于时代。5.Maintain your momentum in business, or fall behind the curve.保持工作动能,否则你将远远落后。