1
a backlog of [work/orders/etc.]
backlog 是可数名词，常用单数形式，后接 of 说明积压的具体内容。
There is a backlog of orders after the holiday.
假期后有一批积压的订单。
积压；积压的工作
backlogs — plural of backlog
先理解核心含义，再看它在真实句子里的用法。
积压；积压的工作
An accumulation of unfinished work, unfilled orders, or unprocessed materials that needs to be dealt with.
There is a backlog of orders after the holiday.
假期后有一批积压的订单。
篝火后部的大木柴。
A large log to burn at the back of a fire.
储备；备用物资。
A reserve source or supply.
积压；尤指未完成的订单、未消耗的产品或未完成工作的积累。
An accumulation or buildup, especially of unfilled orders, unconsumed products or unfinished work.
记录已读文本的日志,如文字游戏或聊天室中的历史记录。
A log containing text previously read, as in text-based video games or chat rooms.
I have a huge backlog of emails to answer after my vacation.
我休假回来后有大量积压的电子邮件需要回复。
The factory is working overtime to clear the backlog of orders.
工厂正在加班处理积压的订单。
There is a backlog of applications at the immigration office.
移民局积压了大量申请。
backlog 是可数名词，常用单数形式，后接 of 说明积压的具体内容。
There is a backlog of orders after the holiday.
假期后有一批积压的订单。
We have a backlog of emails to answer.
我们有一堆积压的电子邮件要回复。
backlog 常与 clear、work through、reduce 等动词搭配，表示处理积压的事务。
She spent the weekend clearing the backlog of paperwork.
她花了整个周末清理积压的文书工作。
Not this
I have backlog of work to finish before Friday.
Use this
I have a backlog of work to finish before Friday.
backlog 是可数名词，通常说 a backlog of work，表示“一批积压的工作”。中文的“积压的工作”没有冠词概念，所以学习者容易漏掉 a，但英语中必须用不定冠词。
Not this
The customer-service team needs to solve the backlog of complaints.
Use this
The customer-service team needs to clear the backlog of complaints.
表示处理积压的事务，英语习惯搭配 clear / work through / reduce a backlog，而 solve 常用于解决问题或谜题，与 backlog 搭配不自然。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
清理积压的工作（或订单、申请等）
We need more staff to clear the backlog of applications.
我们需要更多员工来清理积压的申请。
积压的工作
After the holiday, there was a big backlog of work.
假期过后，积压了大量工作。
积压的订单
The factory cannot ship the goods because of a backlog of orders.
由于订单积压，工厂无法发货。
减少积压
The manager introduced overtime to reduce the backlog.
经理安排加班以减少积压。
积压的案件
The court has a large backlog of cases to hear.
法院有大量积压案件待审理。
大量积压
I have a huge backlog of emails to read.
我有大量积压的电子邮件要读。
清理积压（的工作、订单等）
The support team stayed late to clear the backlog of tickets from the weekend.
支持团队加班到很晚，以清理周末积压的工单。
逐一处理积压的事务
It took me a whole week to work through the backlog of emails after my vacation.
休假回来后，我花了整整一周才处理完积压的邮件。
积压的订单
The factory has a backlog of orders and cannot accept new ones until next month.
工厂有积压的订单，到下个月之前无法接新单。
Use backlogs naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：back（后面）+ log（原木）→ 堆在后院的原木越积越多，就是积压的工作或订单。
语域：neutral 常见场景：project management、business operations、customer service backlog 作名词时，最常指积压未完成的工作或订单，通常用于工作、项目管理和客服等场景；语体上比较中性，正式和日常职场交流中都较常见。
All six words rhyme with the final -log in 'backlog' when it is pronounced /lɔːɡ/ (American) or /lɒɡ/ (British). They share the transparent spelling chunk -log. Beware of -ough lookalikes: 'cough' /kɔːf/, 'rough' /rʌf/, and 'through' /θruː/ have completely different sounds. Also note that -logue spellings such as 'catalogue', 'dialogue', and 'analogue' have the same final sound but add -ue in writing.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.