如题所述
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。
She's always full of energy.
她总是充满活力。