1·He fell behind the others in study.
他在学习方面落后于其他人。
2·My turtle fell behind a radiator and was not discovered until too late.
我的龟掉到一个散热器的后面，发现时已经太晚了。
3·She soon fell behind the leaders.
她很快就落在领先者的后面。
—— 《牛津词典》
4·Soon he fell behind in the race.
很快他在赛跑中落在了后面。
5·So he fell behind in his studies.
于是他学习落后了。
6·Smith fell behind in the race.
史密斯在赛跑中落后了。
7·He fell behind with his work.
他工作落后了。
8·The horse fell behind in the race.
那匹马在比赛中落后了。
9·But he never fell behind.
但他从不落人后。
10·The leader's opinion had fell behind.
那个领导的观点已经落伍了。