1. I like to take some energetic exercise at weekend.
   我喜歡在周末做些劇烈運動。
2. His son is an energetic child.
   他的兒子是個精力旺盛的孩子。

en.er.get.ics

n.(used with a sing. verb)（名詞）（與單數(shù)動詞連用）
The study of the flow and transformation of energy.
力能學：研究能量的流動及轉變的學科
The flow and transformation of energy within a particular system.
能量學：一個特定體系的能量流動和轉換