1 [U] the ability to be very active or do a lot of work without getting tired 活力；精力: Children are usually full of energy. 小孩子通常精力充沛。

2 [U] the power that comes from coal, electricity, gas, etc that is used for producing heat, driving machines, etc 能量；能源: nuclear energy 核能an energy crisis 能源危机

3 energies [pl] the effort and attention that you give to doing sth （放在工作上的）精力: She devoted all her energies to helping the blind. 她尽心尽力帮助盲人。

4 [U] (technical术语) the ability of a substance or system to produce movement 力量: kinetic/potential energy 动力；潜力