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。
It's a waste of time and energy.
那是浪费时间和精力。
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。