reduce paper usage
减少纸张使用量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For the PIXMA MG4220 Wireless and PIXMA MG3220 Wireless printers, Auto Duplex printing has been included to help reduce overall paper usage costs.
ENGADGET: Canon expands its PIXMA line with MG2220, MG3220 and MG4220 all-in-ones
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