两面印
两面印-
两面施印的纸，不透明度平均最好是百分之九十。
An average opacity of 90 % is recommended for paper printed both side .
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1987年新加坡重新设计1元硬币，在正反两面都印上一个八边形，许多人认为这样做能够平息龙魂，让新加坡迎来一个新的经济增长期。同年九月，新设计的1元硬币在国内正式发行。
The 1987 Singapore $ 1 coin was designed with an octagon on both sides , which some believe quelled the dragon spirits and allowed Singapore to embark on a new period of economic growth .
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双面印刷机：一次性把纸张的两面同时施印的印刷机。印刷通过印刷铅字制造（印刷品或印记）
Perfector : A printing press which print both sides of a sheet of paper in a single pass through the press . To produce ( a print or an impression ) from type .