In the exam there's sure to be a question on energy.

　　考試時準有關于能量的題目。

　　It's a waste of time and energy.

　　那是浪費時間和精力。

　　He has carried out extensive research into renewable energy sources.

　　他已經對再生能源進行了廣泛研究。

　　Her mother was a resourceful and energetic woman.

　　她母親是一個足智多謀、精力充沛的女人。

　　The company is trying to create a young energetic image.

　　這家公司正試圖塑造一個充滿活力的年輕形象。

　　He knew I was energetic and dynamic and would get things done.

　　他知道我精力充沛、生氣勃勃，會把事情辦成的。