behind schedule
collocation落后于计划；误期
The project is behind schedule.
这个项目落后于计划了。
落后的；处于劣势的
先理解核心含义，再看它在真实句子里的用法。
落后的；处于劣势的
having a lower score or losing position in a competition
Our team is behind by ten points.
我们队落后十分。
未达到要求或预期的程度；逾期或拖欠
Not advanced to the required or expected degree; overdue or in arrears.
缓慢的
Slow.
比赛中得分较低或处于落后位置
having the lower score or lagging position in a contest
She was behind in the early laps but caught up later.
她在前几圈落后，但后来追了上来。
AI contextual example
I'm behind in the score, but I still have a chance.
我在分数上落后，但我还有机会。
AI contextual example
behind by two points
落后两分。
WordNet
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落后于计划；误期
The project is behind schedule.
这个项目落后于计划了。
拖欠付款
He is behind in his rent payments.
他拖欠了房租。
过时的；落伍的
Their teaching methods are behind the times.
他们的教学方法过时了。
落后于课程进度
She is behind in class because she missed many lessons.
她因为缺了很多课而落后于班级进度。
落后两球
The team was behind by two goals at halftime.
这支球队半场时落后两球。
工作进度落后
I'm behind in my work after taking a week off.
请了一周假后，我的工作进度落后了。
过时的；跟不上时代的
My grandfather is a bit behind the times when it comes to technology.
我祖父在科技方面有点跟不上时代。
秘密地；私下里
The deal was negotiated behind closed doors.
这笔交易是秘密谈判达成的。
处于困境；处于不利地位
After losing his job, he found himself behind the eight ball.
失业后，他发现自己陷入了困境。
Use behind naturally, then get feedback on meaning, tone, grammar, and phrasing.
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behind 可拆成 be + hind，hind 意为“后面的”；想象人或账单落在后面，就是落后、逾期、缓慢。
语域：mixed 常见场景：finance/debts、work/study、sports behind 作形容词时，多用于日常口语或一般叙述，表示“落后的、拖欠的、缓慢的”。场景上，财务欠款、学习工作进度、体育比分都较常见。正式公文或合同里更常使用 overdue、in arrears 等词，而在日常交流中直接用 behind。语气总体中性偏非正式。
通常作表语，后接介词in表示在某方面落后。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, OCTANOVE, WIKTIONARY.