fall behind   (TTS發音)

fail to keep up落後；跟不上John fell behind in his studies and finally had to leave school. 約翰學習跟不上，最後只好退學。

    To be promoted or to fall behind is not a matter of salary but even more a matter of selfrespect. 升職或者落後不僅僅是薪金的問題，更重要的是自尊。

    I don't want to fall behind in my studies. 在學習上我不想落伍。

    Diligence helps one to go forward，where as laziness makes one fall behind. 勤奮使人上進，懶惰使人落後。