复数，因为裤子总会有两个裤管，所以trousers就是复数。trousers主要作为名词，作名词时意为“裤子，长裤”。相关短语：flare trousers喇叭裤；中腰长阔裤；cotton trousers棉裤；棉毛裤；棉制长裤。
trousers用法trousers可以用作名词，表示裤子条数时用pair。
trousers修饰其他名词作定语时用单数形式。
trousers用作名词的用法例句：
Flared trousers are out this year.今年喇叭裤不时兴了。
The boy's trousers need a patch on the knee.这孩子的裤子膝盖上需要打个补丁。
trousers相关例句The trousers have double thickness knee panels for extra protection.
这条裤子上有双倍厚的护膝片以加强保护。
These trousers are a bit tight.
这条裤子有点紧。
I was still in short trousers at the time.
我那时还在穿着短裤呢。
A wool jacket complements the silk trousers and provides an interesting contrast in texture.
毛料上衣配真丝长裤，质地上的差异非常有趣。
There were holes in the knees of his trousers.
他裤子的膝部有破洞。
