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carry a backpack
carry a backpack 表示“背着背包”，不强调背上的动作。
She carries a backpack to school every day.
她每天背着一个双肩包上学。
背包；双肩包
先理解核心含义，再看它在真实句子里的用法。
背包；双肩包
A bag with straps worn on the back for carrying things, used especially by students or hikers.
She carries a backpack to school every day.
她每天背着一个双肩包上学。
背包,常装在轻型框架上,由背带支撑,背负在背上以携带物品,尤其用于徒步或学生背书包。
A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.
一种背在背部或肩上的包
a bag carried by a strap on your back or shoulder
背在背上的降落伞或其他生命保障设备包。
A similarly placed item containing a parachute or other life support equipment.
She packed her laptop and notebooks into her backpack before heading to the library.
她在去图书馆之前把笔记本电脑和笔记本装进了背包。
His backpack was so heavy that he had to stop and rest every few minutes.
他的背包太重了，他不得不每隔几分钟停下来休息。
I always keep a water bottle and a snack in my backpack when I go hiking.
我去远足时总是在背包里放一瓶水和一份零食。
carry a backpack 表示“背着背包”，不强调背上的动作。
She carries a backpack to school every day.
她每天背着一个双肩包上学。
put on 表示“背上”，take off 表示“取下”，二者相对。
He put on his backpack and left the house.
他背上背包，离开了家。
full of 后接背包里装的东西，说明其内容。
I found a backpack full of old photos in the attic.
我在阁楼上发现一个装满旧照片的背包。
with a backpack 作定语修饰人，表示“背着背包的”。
A traveler with a backpack asked me for directions.
一个背着背包的旅行者向我问路。
Not this
He carries backpack to school every day.
Use this
He carries a backpack to school every day.
backpack 是可数名词单数，前面需要不定冠词 a；中文没有冠词系统，学习者容易漏掉，因此要加 a 表示“一个背包”。
Not this
There are three backpack on the shelf.
Use this
There are three backpacks on the shelf.
backpack 的复数形式是 backpacks，在 three 等数量词后必须用复数，中文名词本身不变化，所以容易漏掉 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
学生背包；书包
She carries her school backpack every day.
她每天背着她的学生背包。
登山背包；徒步背包
A good hiking backpack is essential for a long trail.
一个好的登山背包对于长途徒步来说至关重要。
背着背包
I always carry a backpack when I travel.
我旅行时总是背着背包。
往背包里装东西；整理背包
She packed a backpack with clothes for the weekend.
她为周末出游往背包里装了衣服。
沉重的背包
The heavy backpack slowed him down.
沉重的背包拖慢了他的速度。
背包肩带
Tighten the backpack straps to secure the load.
系紧背包肩带，固定好里面的东西。
背包！背包！
In Dora the Explorer, Dora calls out 'Backpack! Backpack!' to summon her talking backpack.
在《爱探险的朵拉》中，朵拉喊“背包！背包！”来召唤她那只说话的背包。
Use backpack naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象把pack（包）背在back（背）上，就成了backpack双肩包。
语域：neutral 常见场景：school、hiking、travel “backpack” 作名词时指双肩背包，属于中性常用词，日常口语和书面语中都很自然；通常用于描述上学、徒步或短途旅行时背在背上的包。
可数名词
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.