Definition
To progress more slowly than planned or expected, resulting in a failure to meet deadlines or targets.
落後於預定時間；落後計劃
Due to supply chain issues, our production has fallen behind schedule.
由於供應鏈問題，我們的生產進度已經落後了。
If we don't speed up, this project will fall behind schedule.
如果我們不加快速度，這個項目將會進度落後。
The software development has fallen behind schedule due to unexpected technical issues.
由於意外的技術問題，軟件開發進度已經落後了。