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因为在大多数农村地区，这一地区有足够的新鲜空气和繁茂的植被。
As in most rural areas, this area has plenty of fresh air and luxuriant vegetation.
在施工或翻新后，给设施通风能有所帮助，因为通风可以确保每小时足够的新鲜空气交换。
Out of facilities after construction or renovation can help, as can ensuring sufficient fresh air exchanges each hour.
如果采用空调系统，则应确保有足够的新鲜空气引入及保持系统有适当清洁和维修保养。
If air-conditioning system is used, care should be taken to ensure sufficient fresh air to be introduced into the system, and the system should be properly cleaned and maintained.
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