energy n. 能；能量；活力；力量；精力（可用复数）

　　例如：1) atomic / electrical energy原子能/ 电能

　　 the energy of the sun / the solar energy太阳能

　　 the sources of energy / energy sources 能源

　　 2) The teacher devotes all her energies/ energy to the class.

　　 老师吧全部精力都倾注在那个班上。

　　 3) The old doctor seemed to have more energy， after his recovery from his serious illness， than even the young.

　　 这位老医生在重病复原后似乎比青年人精力还要充沛些。

　　派生：energetic adj. 精力充沛的；energetically adv. 精力旺盛地；energy-saving adj. 节约能源的。

　　辨析：power /energy /strength。

　　三者都有“力”的意思，但“力”的性质和来源不同。energy指生理上的“精力”，“力气”（相当于strength）或物理学上的“能”；power指“能力；权力”，in power“执政”,“当权”；strength指“体力；力量；强度”。

　　小试：用energy ，power或strength的正确形式填空：

　　1. In England the party in ____ is sometimes the Labour Party and sometimes the Conservative Party（保守党）.

　　2. What impressed us most was that he was always full of ____.

　　3. I have hardly enough ____ left to move my feet.

　　(key: 1. power 2. energy 3. strength )