1
a ballpoint pen
ballpoint 常与 pen 连用，完整形式是 ballpoint pen。
She always keeps a ballpoint pen in her bag.
她包里总放着一支圆珠笔。
圆珠笔
先理解核心含义，再看它在真实句子里的用法。
圆珠笔
ballpoint
She always keeps a ballpoint pen in her bag.
她包里总放着一支圆珠笔。
一种尖端圆形的针。
A kind of needle with a rounded tip.
She signed the contract with a blue ballpoint.
她用一支蓝色圆珠笔在合同上签了字。
My backpack always contains a notebook and a ballpoint for class.
我的背包里总是装着一个笔记本和一支圆珠笔，以备上课用。
He prefers a ballpoint because its ink dries quickly.
他更喜欢圆珠笔，因为圆珠笔的墨水干得快。
ballpoint 常与 pen 连用，完整形式是 ballpoint pen。
She always keeps a ballpoint pen in her bag.
她包里总放着一支圆珠笔。
单独说 a ballpoint 即可表示圆珠笔，pen 可省略。
He wrote the note with a ballpoint.
他用圆珠笔写了便条。
[color] 为颜色形容词，如 black、blue、red。
Please use a black ballpoint for the form.
请用黑色圆珠笔填写表格。
Not this
I bought a ballpoint yesterday. Can you lend me ballpoint?
Use this
I bought a ballpoint yesterday. Can you lend me a ballpoint?
ballpoint 是可数名词，单数形式不能像汉语“笔”一样裸用，前面需要加限定词 a/the。
Not this
There are three ballpoint on the desk.
Use this
There are three ballpoints on the desk.
ballpoint 是可数名词，表示复数时要在词尾加 -s，与 three 等数量词搭配时必须用 ballpoints。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
圆珠笔
She signed the document with a ballpoint pen.
她用圆珠笔签署了文件。
圆珠笔油墨
Ballpoint ink dries quickly on most papers.
圆珠笔油墨在大多数纸上干得很快。
圆珠笔笔芯
This pen takes a standard ballpoint refill.
这支笔使用标准圆珠笔笔芯。
用圆珠笔书写
He prefers to write with a ballpoint rather than a fountain pen.
他更喜欢用圆珠笔写，而不是用钢笔。
Use ballpoint naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
球在笔尖：Ball（球）+ point（尖端），圆珠笔的笔尖有个小圆珠，滚动带出墨水。
语域：neutral 常见场景：日常书写、文具描述、购买清单 ballpoint 是中性常用词，通常适用于日常交流，也可用于文具说明或购物场景，多指圆珠笔。
point、joint、appoint 的重读末尾音节都是 /pɔɪnt/ 或 /ɔɪnt/，与 ballpoint 中的 -point 押韵。pointer 拼写和读音都含有 point 的 /pɔɪnt/，但多了一个 /ər/，所以不算完全押韵。ballpark 开头拼写和读音 /bɔːl/ 与 ball 相同，但结尾与目标词不同；ballot 拼写看似以 ball 开头，但读音是 /ˈbæl.ət/，元音不同。
Dictionary facts from ECDICT, WIKTIONARY.