be active的用法和樣例：
例句
- We are looking for dynamic persons to be salesmen.
我們正在尋找充滿活力的銷售人員。 - I wish I could be as active as your grandfather, he looks like a teenager.
我希望我能夠像你祖父那樣充滿活力，他看起來就像十幾歲的年輕人。 - He became an active social reformer.
他成了一位積極的社會改革家。 - We must be active in arousing the masses to action.
我們要積極發動群眾。
