extruding unit造句

• The main parts are four sets of extruding units , three sets of dies ( one is double layer commonly extruding die ) , three sets of forming systems with synchronization drawing , two sets of automatic letoff systems , one sets of wrap - up system
  主要由：四部挤出机组、三套模具（其中一套为双层共挤模具） 、三组成型系统、二组自动放卷系统、一组自动收卷系统。