我建议多植树以保持空气新鲜。
我们应该保持空气新鲜阻止细菌。
保持顺风窗略微打开以获得新鲜空气。
最后，我们应该保持我们的房间干净，空气新鲜。
Finally, we should keep our rooms clean and the air fresh all the time.
体育锻炼、新鲜空气和睡眠是保持健康所必需的。
Exercise, fresh air and sleep are essential for the preservation of health.
适当的运动、新鲜的空气和充足的睡眠对于保持健康是非常必要的。
Moderate exercise, fresh air, and enough sleep are essential for the preservation of good health.
我们需要新鲜的空气来呼吸，我们需要纯净的水来饮用，我们需要一个干净的环境来保持健康。
We need fresh air to breathe. We need pure water to drink. We need a clean environment to be healthy.
我们应该保持空气清洁和新鲜，保持身体干净。
We should keep the air clean and fresh and keep our bodies clean.
保持房间整洁卫生空气新鲜。
房间要经常开窗透风，保持室内空气新鲜。
The room often should open window leak, maintain indoor air fresh.
房间要经常开窗透风，保持室内空气新鲜。
The room often should open window leak, maintain indoor air fresh.
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