这句话怎么理解?

With the Roadmaker, a crew can repave a mile of decayed road in less time than with the competing model, which is, however, much less expensive. Reduced staffing levels made possible by the Roadmaker eventually compensate for its higher price. Therefore, the Roadmaker is especially advantageous where average wages are low.

好难懂得话啊

roadmaker is more expensive than the competing model, but it saves time.

Improved efficiency reduce the size of staff. This in turn cancels out the higher price of the Roadmaker.

therefore, if the average wages are low, it becomes especially advantageous : for a certain worker, the lower the average wage is, the less the total pay is; for a given project to be finisehd in a given period of time, if you use the Roadmaker, less worker will be needed.