duplex punch

例句：

1. 1. The printer uses a duplex punch to print on both sides of the paper.
   打印机使用双打孔机在纸张的两面打印。
2. 2.The punched card was used to store and retrieve information quickly.
   穿孔卡片被用来快速存储和检索信息。
3. 3. The company introduced a new duplex punch that improved printing quality.
   该公司推出了一种新的双打孔机，提高了打印质量。