On a hot day, a tree can release tens of gallons of water into the air, acting as a natural air conditioner for its surroundings.
在炎热的白天，一棵树能够向大气中释出数十加仑的水分，对周围环境起到自然空调器的作用。
However, for a while the land around the city acted as a natural air conditioner, keeping the air cool through evaporation of moisture from the ground.
不过，有一段时间，莫斯科市周围的土地起到了自然空调的作用，通过从地面蒸发湿气保持空气凉爽。
These homes were all built to take advantage of simple, natural cooling methods–no air conditioner required.
这些住宅都利用简单、自然的冷却方法而建——无需空调。
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