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。

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.

youdao

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。

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.

youdao