开窗通风

Please open the window to keep the air in the ward fresh.

请开窗通风，保持病室空气清新。

Wash your hands before each meal and open Windows very often even though in winter.

饭前洗手，经常开窗通风，即使在冬天也如此。

Opening the window and let fresh air enter room is the best way to improve indoor air quality and people´s heath.

通过开窗通风，可以不断改善室内空气质量。达到提高人体健康的目的。

Wash our hands often, especially before meals and have healthy food and drink enough waterevery day.

我们也应该勤开窗通风，经常洗手，尤其饭前，并且吃健康食品，每天喝水。

To introduce the fresh air through opening Windows can not meet the demand of people and increase the energy consumption of air-conditioning.

使用开窗通风的方式既不能保证室内新鲜空气的供应量，也是最不节能的方式。