裤子的复数
trousers,裤子一般都用复数,单说trouser,是一条裤腿儿,而裤子都用pair修饰
如一条裤子 a pair of trousers
两条裤子 two pairs of trousers
例句
There were holes in the knees of his trousers.
他裤子的膝部有破洞。
The trousers have a fly fastening.
这条裤子是前开口。
He dropped his trousers.
他脱了裤子。
This month\'s offers include a shirt, trousers and bed covers
本月的特价商品包括一款衬衫、裤子和多种床罩。