To try and meet these changing demands a lot of new methods have been developed to complement the conventional size reduction machinery such as rotary cutters, planetary and attrition mills.

• 为了尽力满足需求的变化，发展起来许多新方法来弥补常规的粉碎机械，比如旋转破碎机、行星磨和研磨机的不足之处。