cotton gin       
noun [ C ] uk/ˈkɒt.ən ˌdʒɪn/ us/ˈkɑː.t̬ən ˌdʒɪn/
 轧棉机,轧花机
a machine used for separating the fibres of the cotton plant from the seeds
  The building housed the old cotton gin.
 - More examples
 - The small agricultural town of Shelby has a cotton gin, two liquor stores and not much else.
 - James Henry also ran a winery, a nursery and orchards, and owned a cotton gin.
 - At the museum, you can wear a corset, use a cotton gin or try other activities Americans would have done in the past
 - Her father was a cotton gin operator.