According to a recent European Union "green purchasing" guide, duplex printing can cut costs by 38% over the life of a printer.
根据最近一份欧盟的绿色采购指南，双面打印能够削减一台打印机寿命中38%的成本。
3Use the duplex printing option on your printer to use both sides of a sheet of paper.
3利用打印机的双面打印功能来使用纸的正反面。
3Use the duplex printing option on your printer to use both sides of a sheet of paper.
3利用打印机的双面打印功能来使用纸的正反面。
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