1
a pair of trousers
He bought a new pair of trousers.
他买了一条新裤子。
裤子；长裤
trousers — plural of trouser
先理解核心含义，再看它在真实句子里的用法。
裤子；长裤
a pair of trousers
He bought a new pair of trousers.
他买了一条新裤子。
与裤子有关的
Of or relating to trousers.
一条裤子
A pair of trousers.
He bought a new pair of trousers for the job interview.
他为了面试买了一条新裤子。
These trousers are too tight around the waist.
这条裤子腰部太紧了。
She rolled up her trousers before walking through the puddle.
她卷起裤子，然后走过水坑。
He bought a new pair of trousers.
他买了一条新裤子。
trousers 作主语时，谓语动词用复数。
These trousers are too long for me.
这条裤子对我来说太长了。
trouser 用作定语时，一般用单数形式。
She was wearing a trouser suit.
她穿着一件裤套装。
Not this
I bought a trouser yesterday.
Use this
I bought a pair of trousers yesterday.
在英语中，“trouser”通常以复数形式“trousers”出现，表示一条裤子。要表示一条裤子，需使用“a pair of trousers”。
Not this
He is wearing trouser.
Use this
He is wearing trousers.
服装类名词如“trousers”通常采用复数形式，即使指一条裤子也需要用复数。因此应使用“trousers”而非单数“trouser”。