keep-fit的用法和樣例：
例句
用作名詞 (n.)
- Gymnasts do everyday exercises to keep themselves limber.
體操運動員每天都做運動保持身體柔軟。 - The pain of the coughing fit had not quite driven out of Winston's mind the impression made by his dream, and the rhythmic movements of the exercise restored it somewhat.
那場大夢在溫斯頓心裡留下的痕迹煞是強烈，咳嗽大發作帶來的痛苦也未能趕它出去，體操有節奏的動作倒有點恢復了它。
