a pair of blue jeans的用法和样例：
- She was wearing a pair of tight blue jeans.
- She is wearing a yellow cotton blouse and a pair of blue jeans.
- She wore a yellow silk blouse with a blue silk scarf and a pair of blue jeans at the show.
- Mrs. Oh,yes,I've got some clothes to be laundered. Here are two suits,a pair of blue jeans,blouses,shirts,panties,and some soiled linen of the kids.
- The carpenter was wearing a pair of blue overalls.