1
lag behind
常用搭配，表示落后于他人或进度。
She was tired and lagged behind the others.
她累了，落在了其他人后面。
落后；跟不上
先理解核心含义，再看它在真实句子里的用法。
落后；跟不上
to fail to keep up; to fall behind
She was tired and lagged behind the others.
她累了，落在了其他人后面。
未能跟上(步伐),落后。
To fail to keep up (the pace), to fall behind.
用毛毡条或类似材料覆盖(例如管道)。
To cover (for example, pipes) with felt strips or similar material.
放松；减缓。
To slacken
lag
Base
原形
lags
3rd person
第三人称单数
lagging
-ing
现在分词
lagged
Past
过去式
lagged
Past participle
过去分词
The network often lags during peak hours.
网络在高峰时段经常卡顿。
The game lagged a lot yesterday.
昨天游戏卡顿得很厉害。
My computer has lagged since the update.
我的电脑从更新后就一直卡顿。
注意：规则动词，过去式和过去分词均为-ed形式。
He started to lag behind the group during the hike because of his injured ankle.
由于脚踝受伤，他在徒步中开始落后于队伍。
My computer tends to lag when I open too many browser tabs.
当我打开太多浏览器标签页时，我的电脑往往会卡顿。
The runner lagged significantly in the final lap and finished last.
这位跑者在最后一圈明显落后，最终排名垫底。
常用搭配，表示落后于他人或进度。
She was tired and lagged behind the others.
她累了，落在了其他人后面。
表示在某个方面发展缓慢。
The project is lagging in development due to lack of funds.
由于缺乏资金，该项目在开发上滞后。
指给管道等加保温层。
They lagged the pipes with foam insulation.
他们用泡沫隔热材料包裹管道。
Not this
He lags me in math.
Use this
He lags behind me in math.
动词lag表示'落后于'时，通常需要搭配介词behind才能接宾语，直接跟宾语是及物用法但较少见，且在此语境下不自然。
Not this
He laged behind last year.
Use this
He lagged behind last year.
动词lag的过去式需要双写词尾g再加-ed，即lagged，而不是laged。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
落后
She refused to lag behind and worked hard to catch up.
她不甘落后，努力追赶。
落后于计划
The project started to lag behind schedule due to delays.
由于延误，项目开始落后于计划。
远远落后
In terms of education, some rural areas lag far behind urban centers.
在教育方面，一些农村地区远远落后于城市中心。
在发展上落后
The country's economy lags in development compared to its neighbors.
该国的经济与其邻国相比，在发展上落后。
给管道加保温层
To prevent freezing, we need to lag the pipes before winter.
为了防止结冰，我们必须在冬天前给管道加保温层。
落后
She has been ill and has lagged behind in her schoolwork.
她生病了，功课落下了。
时差反应
After flying from New York to Tokyo, I had terrible jet lag.
从纽约飞往东京后，我时差反应很严重。
文化滞后
The rapid technological change has created a cultural lag in many societies.
快速的技术变革在许多社会造成了文化滞后。
Use lag naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想单词leg（腿），腿受伤就落后（lag），发音相似，意思相关。
语域：neutral 常见场景：技术、发展、经济 通常用于描述进度或速度方面的落后，多见于技术、经济等领域。
常与behind连用，表示落后于；也可用作及物动词，表示落后于某人或某物
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.