喜欢关上门窗，冷空气肆虐的时候。
Like behind closed doors and Windows, when the cold air outbreak.
你离开实验室前必须关上门窗以防下雨。
The doors and Windows are to be shut in case of rain before you leave the lab.
牢牢地关上门窗，防止花粉和孢子的进入。
Keep your Windows and doors tightly closed to help prevent pollen and spores from entering into your home.
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