1
in a swimsuit
in + 衣物表示穿着状态，也可作后置定语，如 a girl in a swimsuit。
She was in a swimsuit when the doorbell rang.
门铃响时她穿着泳衣。
游泳衣；泳衣
先理解核心含义，再看它在真实句子里的用法。
游泳衣；泳衣
tight-fitting garment worn for swimming
She was in a swimsuit when the doorbell rang.
门铃响时她穿着泳衣。
游泳时穿的服装；泳装
A garment worn for swimming.
紧身的游泳服
tight fitting garment worn for swimming
女性穿着的紧身连体泳装
A tight-fitting one-piece garment worn by women and girls.
She packed her swimsuit for the beach trip.
她为海滩之旅打包了泳衣。
I need to buy a new swimsuit before our vacation.
我们度假前我需要买一件新泳衣。
These swimsuits are on sale at the sports store.
这些泳衣在体育用品店打折。
in + 衣物表示穿着状态，也可作后置定语，如 a girl in a swimsuit。
She was in a swimsuit when the doorbell rang.
门铃响时她穿着泳衣。
that 引导定语从句修饰 swimsuit，指物。
I need a swimsuit that dries quickly.
我需要一件干得快的泳衣。
for 后接活动或用途，说明泳衣的适用场合。
This is a swimsuit for competitive swimming.
这是一件比赛用的泳衣。
Not this
She bought two swimsuit.
Use this
She bought two swimsuits.
swimsuit 是可数名词，two 后要用复数 swimsuits；中文名词没有复数变化，所以容易漏掉 -s。
Not this
She is wearing swimsuit.
Use this
She is wearing a swimsuit.
swimsuit 是可数名词单数，作宾语时前面需要不定冠词 a；中文没有冠词，所以容易漏掉 a。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
穿泳衣
She wore a swimsuit to the beach.
她穿着泳衣去海滩。
穿上泳衣
I put on my swimsuit before going into the water.
下水前我穿上了泳衣。
脱掉泳衣
He took off his wet swimsuit in the locker room.
他在更衣室脱掉了湿泳衣。
打包泳衣；把泳衣装进行李
Don't forget to pack a swimsuit for the trip.
旅行时别忘了把泳衣装进行李。
买泳衣
I need to buy a new swimsuit for the summer.
我需要为夏天买一件新泳衣。
Use swimsuit naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：swim（游泳）+ suit（套装），游泳时穿的专用“套装”就是泳衣。
语域：neutral 常见场景：swimming、beach、water sports swimsuit 属于中性常用词，日常对话和一般书面表达都常见，多用于描述游泳、海滩或水边活动时穿的服装。
swimsuit 的 IPA 为 /ˈswɪmˌsut/，其中 -suit 读 /sut/（这是 /suːt/ 不带长音符号的写法）。suit、pursuit 的标准音为 /suːt/，与它一致；fruit、recruit、grapefruit 也以 /uːt/ 结尾，与 -suit 押韵。注意 biscuit 是拼写相似的反例，读 /ˈbɪskɪt/，-uit 读 /ɪt/，不要与 suit 混读。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.