energy做能源时 可数吗
energy是不可数名词，意思是活力、精力、能力、能量。
例句
Its a waste of time and energy.
那是浪费时间和精力。
She was bouncy and full of energy.
她生气勃勃，精力充沛。
It is important to conserve energy.
节能十分重要。
She was brimful of energy and enthusiasm.
她精力充沛，热情洋溢。
Renewable sources of energy must be used.
可再生的能源必须利用。
The whole of creation is made up of energy.
全宇宙是由能量构成的。
He was a man of stupendous stamina and energy.
他是个有着一流耐力、精力充沛的人。
He felt bright and cheerful and full of energy.
他感到兴高采烈，浑身充满活力。