• 1. Exercise to keep fit: 锻炼身体保持身材 | 为保持健康而锻炼
• 2. Doing exercise to keep fit: 做运动去保持身体健康
• 3. exercise more to keep fit: 多做锻炼保持健康

• 1.Exercise to keep fit.
  为保持适当行使。
  dict.yoduao.com
• 2.He does exercise to keep fit every day.
  为了健康他每天做锻炼。
  dict.yoduao.com
• 3.You should take more exercise to keep fit.
  你需要多多锻炼身体来保持健康。
  dict.yoduao.com

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