1
a pair of underpants
underpants 是复数名词，表示一条内裤时常用 a pair of underpants。
I need to buy a new pair of underpants.
我需要买一条新内裤。
内裤；短内裤
先理解核心含义，再看它在真实句子里的用法。
内裤；短内裤
an undergarment worn next to the skin, covering the body from the waist to the thighs
I need to buy a new pair of underpants.
我需要买一条新内裤。
Underwear covering the genitalia and often buttocks, usually going no higher than the navel.
覆盖腰部到大腿的内衣；通常贴身穿着
an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin
He bought a new pair of underpants at the store.
他在商店买了一条新内裤。
She packed clean underpants in her suitcase for the trip.
她为旅行在行李箱里放了几条干净的内裤。
These underpants are made of soft cotton and feel comfortable.
这些内裤由柔软的棉制成，穿着舒适。
underpants 是复数名词，表示一条内裤时常用 a pair of underpants。
I need to buy a new pair of underpants.
我需要买一条新内裤。
in one's underpants 表示“只穿着内裤”的状态。
He answered the door in his underpants.
他只穿着内裤就去开门了。
underpants 总是复数形式，作主语时谓语动词用复数。
These underpants are made of cotton.
这条内裤是棉质的。
Not this
I bought an underpants.
Use this
I bought a pair of underpants.
underpants 是复数名词，不能直接用 a/an 修饰；表示“一条”时应使用 a pair of underpants。
Not this
My underpants is dirty.
Use this
My underpants are dirty.
underpants 只有复数形式，即使指一条内裤也按复数名词处理，因此谓语动词应用 are。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
一条内裤
He bought a new pair of underpants.
他买了一条新内裤。
穿内裤
Most children wear underpants under their trousers.
大多数孩子在裤子里面穿内裤。
脱下内裤
Take off your underpants and put on the swimsuit.
脱下内裤，穿上泳衣。
提起内裤
After using the toilet, pull up your underpants and trousers.
上完厕所后，提起内裤和裤子。
干净的内裤
Put on some clean underpants after your shower.
淋浴后穿上干净的内裤。
第一阶段：收集内裤。第二阶段：？第三阶段：利润！
The South Park business plan gets a lot of laughs, but nobody can explain the underpants part.
《南方公园》的商业计划让人大笑，但没人能解释内裤那一步。
我就是内裤超人！
Many children love reading about Captain Underpants and his silly adventures.
许多孩子喜欢阅读内裤超人的故事和他那些搞笑的冒险。
Use underpants naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
under（在下面）+ pants（裤子）→ 穿在裤子底下的裤子，就是内裤。
语域：neutral 常见场景：日常对话、购物挑选衣物、清洗整理衣物 underpants 是比较中性的常用词，日常口语和一般书面语里都常见；更正式或更概括的说法常改用 underwear。在购物、洗衣等生活场景中使用很自然。
这些词都以 /ænts/ 音结尾，与 underpants 的最后音节押韵。注意：'plants' 口语中有时读作 /plæns/，但标准音是 /plænts/；拼写相似的 'pans' 读 /pænz/，并不押韵。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.