1939年以前建造的房屋每平方英尺消耗的能源比2000年以后建造的房屋多50%，这主要是由于微小的裂缝随着时间的推移而扩大，更多的外部空气进入了裂缝。
Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.
电磁驱动外部空气的试点。
不要用汽车空调或加热器去循环空气，将操控仪表板选至外部空气会降低内部循环时产生的污染物。
Don't set your car's air conditioner or heater to recirculated air. Selecting the outside air option on your dashboard will reduce the number of pollutants you're circulating inside the car.
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