这台打印机是办公室的真正主力，每天处理数百份文件从不卡纸。

This printer is the real ___workhorse of the office, handling hundreds of documents daily without jamming.

这台打印机是我们办公室的主力设备，因为它从不卡纸。

This printer is the ___workhorse of our office because it never jams.