“牛仔”本来是指在美国西部养牛、骑马的人。

"牛仔" originally referred to people who raised cattle and rode horses in the American West.

现在人们常常用“牛仔”来说一种蓝色的裤子,就是牛仔裤。

Nowadays, people often use "牛仔" to refer to a type of blue pants, which are jeans.