energy的形容词形式是energetic；
energy
n.精力;活力;干劲;力量;能源；
复数： energies；
例句：
Shes always full of energy.
她总是充满活力。
Its a waste of time and energy.
那是浪费时间和精力。
The system produced enough energy to heat several thousand homes.
系统产生的能量足以给几千户人家供暖。
In the exam there's sure to be a question on energy.
考试时准有关于能量的题目。
He has carried out extensive research into renewable energy sources.
他已经对再生能源进行了广泛研究。
There has been a move away from nuclear energy.
人们对于原子能的看法已经转变。
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