back needle造句

• This machine has two needle bar plates and one feeder . it has one or two shuttles for changing the dyed yarn . the back needle bar can be moved to left or right for changing the gauge by handle in order to knit twill pattern
  本机有二块针板，单路进纱，有一只或二只梭子可以调换使用，以变更色纱，后针板可用柄向左或向右移动针距，以织斜形花纹。