jeans一般情况下是复数，jeans是可数名词，而且只有复数形式。n.牛仔裤；工装裤；因为一条裤子有两条裤腿，所以jeans一般情况下是不用单数的，是可数名词。

Skinny jeans are a must-have in todays fashion.

紧身牛仔裤是时尚潮人的必备单品。

These jeans are too tight in the crotch.

这些牛仔裤的裤裆太紧了。

He wears an oily old pair of jeans.

他穿着一条沾满油污的旧牛仔裤。

Where is the jeans with cartoons?

那条有卡通画的牛仔裤在哪？

He wears an oily old pair of jeans.

他穿着一条沾满油污的旧牛仔裤。