New Words：

energy [ˈenərdʒi] n.能源；能量；精力；活力
energetic [ˌenərˈdʒetɪk] adj.精力充沛的；充满活力的

Sample Sentences：

She put all her energies into her work.
Let's try to get some sleep and save our energy.
Don't waste your energy and time on these useless books.

I never saw such an energetic man.
Our coach seems like an energetic person.
She is not so energetic as she used to be.

coach [kəʊtʃ] n.教练;私人教师;长途汽车;长途客车

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