duplicating

You can quickly roll off some extra copies of the exercise on the duplicating machine.

你可以机上很快再几份练习题。

Culture of 5 ％ ;writes office to use paper (hectograph paper, book writes paper, electrostatic duplicating paper, computer to print paper, glazed paper to wait) 110 thousand tons, occupy life of 5 ％ ;

文化书写办公(胶版、书写、静电、电脑打、有)11万吨,占5％;