Keep Windows closed to prevent pollen from coming in the house.

保持窗户关闭以防止花粉进入房间。

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It said people should cover their mouths when outside and keep doors and Windows closed.

还说人们外出时应该遮好嘴巴并且关好门窗。

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Since we're inside with doors and Windows closed for most of the winter it's important to keep the furnace filters clean and clear of dust and other debris.

因为在冬天的大多数时候都会紧闭门窗，所以保持暖气过滤网干净、清洁、没有灰尘和碎石是很重要的。

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But the shutters stayed closed until after astronauts removed the windows' protective covers during a nearly six-hour spacewalk Wednesday.

VOA: standard.2010.02.18

Guests are even asked to keep their windows closed at night to help the same cause.

BBC: The Gal��pagos Islands, a land untouched

Keep the windows closed and the air-conditioning on, giving you an allergen free bubble.

FORBES: Six Brands to Consider and Six Suggestions of What to Do When February Flowers Bring March Allergies

Emergency officials in southern Kent advised residents "to keep doors and windows closed due to a gas cloud".

BBC: French Lubrizol factory struggles to stop foul gas leak