energy/ˈenədʒɪ/
n.-gies1. 活力；精力to devote all one's energies to a job全身心投入工作
Young people usually have more energy than the old.年轻人通常比老年人有活力。
To everyone's surprise, the old painter seemed to have more energy after his recovery from his serious illness than even the young.使大家感到惊讶的是这位老画家在重病复原后似乎比青年人精力还要充沛些。
2. 能atomic energy原子能