A blue pants成立吗,老师说pants是复数,可是又可以写成a pair of pants.我都混乱了

pants 只用于复数形式,习惯的表达方式是a pair of pants .虽然汉语我们说 一条裤子,英语要说a pair of pants .这个说法来自裤子的两条裤腿.例句：Did you buy your pants?Have you seen my pants?I bought a pai...