翻译一句话：these fields of energy can be put to work.

翻译一句话：these fields of energy can be put to work.
语境：For hundreds of years, people have tried to build machines that never stop, but the laws of physics show that it cannot be done. The “space motion”, however, could turn out to be endless. The scientists working on the programme believe that these fields of energy can be put to work. If they are successful, a new and cheap energy source will become available to us.