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back + noun (location)
back在此表示后部的。
He entered through the back door.
他从后门进入。
后面的；后部的
先理解核心含义，再看它在真实句子里的用法。
后面的；后部的
At or near the rear.
He entered through the back door.
他从后门进入。
在后面或靠近后面。
At or near the rear.
归还或恢复到先前的地点或状态。
Returned or restored to a previous place or condition.
过时的,非现行的。
Not current.
位于远离主要或最常去区域的。
Situated away from the main or most frequented areas.
Please use the back door to enter the building.
请从后门进入大楼。
She sat in the back seat of the car during the trip.
旅途中她坐在汽车的后座上。
I prefer sitting in the back row of the classroom.
我喜欢坐在教室的后排。
back在此表示后部的。
He entered through the back door.
他从后门进入。
back在此表示过去的、过期的。
The library has back issues of the magazine.
图书馆有杂志的过刊。
Not this
He sat in the behind seat.
Use this
He sat in the back seat.
“behind”是介词或副词，不能作形容词；应使用“back”表示位置在后。
Not this
I parked in back row.
Use this
I parked in the back row.
“back”作形容词时，前面通常需要冠词（如the）来指定具体位置，尤其在表示“后排”等特定位置时。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
后门
Someone was knocking at the back door.
有人在敲后门。
后座
The child was sitting in the back seat.
孩子坐在后座上。
后院
The kids are playing in the back yard.
孩子们正在后院玩耍。
偏僻小路
We took a back road to avoid the traffic.
我们走了一条偏僻小路来避开交通拥堵。
过刊；往期
The library keeps back issues of the newspaper.
图书馆保存这份报纸的过刊。
欠薪；补发的工资
The company owes him three months of back pay.
公司欠他三个月的薪水。
暂时搁置；留待日后处理
Let's put that idea on the back burner for now.
咱们先把那个想法搁置一下。
退居次要地位；不再起主要作用
He decided to take a back seat and let his son run the business.
他决定退居次要位置，让儿子经营生意。
处于被动；处于不利地位
The home team scored early and put the visitors on the back foot.
主队开场不久便进球，使客队陷入被动。
我会回来的。
Catchphrase from the 1984 film The Terminator, spoken by Arnold Schwarzenegger's character. Widely used to signal a return, often playfully in daily life.
出自1984年电影《终结者》，阿诺德·施瓦辛格饰演的角色的经典台词。用于表示离开后还会回来，日常生活中也常被幽默地引用。
大家，舞动你们的身体。后街男孩回来了，好的！
Chorus from the Backstreet Boys' 1997 hit song 'Everybody (Backstreet's Back)'. The line 'Backstreet's back' became a pop-culture catchphrase meaning the group has returned.
出自后街男孩1997年热门歌曲《Everybody (Backstreet's Back)》的副歌。‘Backstreet's back’成为一句流行文化口号，指该组合回归了。
Use back naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象你背上背着一个包，包在你身后，所以 back 表示“后面的、后部的”。
语域：neutral 常见场景：描述位置或朝向、谈论时间或状态、描述偏远或边缘地点 back 作形容词时通常表示“后面的、后部的”，也可指“过期的、往期的”或“偏僻的”，属于日常中性词汇，口语和书面语都比较常见；具体含义需根据搭配判断。
通常用于名词前，表示位置在后或时间上过去。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.