These engines are not imaging any faster than the sheet fed engines in fact they are slower but use two print engines printing both sides of the web concurrently.

而这类印刷机的成像速度不见得比单张纸的快，但因其可以采用两个印刷引擎，同时印刷卷筒纸的双面，所以效率更高。

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Printing press operators set up and operate sheet and web-fed presses to print text, illustrations and designs on a wide variety of materials such as paper, plastic, glass, leather and metal.

印刷机操作员设置和操作薄板和卷筒纸印刷机，在各种各样的材料上，如纸，塑料，玻璃，皮革和金属，进行打印文字，图片和设计。

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Sets up and operates web-fed offset printing machines including newspaper printing machines.

准备及操作卷筒给纸式柯式平版印刷机包括印报章用的柯式轮转印刷机。

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