rotary knife cutter

例句：

1. 1. This rotary knifecutter is perfect for cutting paper andcardboard.
   这款旋转刀切割机非常适合切割纸张和纸板。
2. 2. Therotary saw is veryuseful for cutting wood and metal.
   旋转锯非常适用于切割木材和金属。
3. 3. The rotary knife cutter iseasy to use and can save a lotof time.
   旋转刀切割机使用方便，可以节省大量时间。