energy作能源讲可数吗

　　She's always full of energy.

　　她总是充满活力。

　　Nuclear energy may overtake oil as the main fuel.

　　核能可能会超过石油成为主要燃料。

　　Achieving success at this level requires a commitment of time and energy.

　　取得这种水平的成就需要花费时间和精力。

　　They are seeking a central, directive role in national energy policy.

　　他们正寻求在国家能源政策方面起中心指导作用。