空气流通

• Keep good indoor ventilation
  保持室内空气流通
• To maintain good ventilation ; and
  保持空气流通
• Maintain good air circulation
  保持空气流通。
• Keep windows open when diluting or using bleach to ensure good ventilation
  调校或使用漂白水时要开窗，使空气流通。
• Windows of offices should be opened from time to time for better ventilation
  办公室的窗户应不时打开，使空气流通。
• Ensure good ventilation
  确保室内空气流通：
• Windows of offices should be opened from time to time for better ventilation
  办公室的窗户应不时打开，使空气流通。
• Avoid crowded places with poor ventilation if you are feeling unwell
  如有不适，避免去人烟稠密和空气流通欠佳的地方。
• To maintain good ventilation
  保持空气流通
• Windows of classrooms should be opened from time to time for better ventilation
  课室的窗户应不时打开，使空气流通。