Definition: slower or later than someone else, or than you should be Level: C1
公共汽车来了，快跟上，别落在后面！
The bus is coming, hurry up, don't stay ___behind!
火车晚点了，我们比计划晚到了。
The train was late, so we arrived ___behind schedule.
项目团队在截止日期上落后了。
The project team is ___behind on its deadlines.
