The cave-making recipe calls for a steady emissionof volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer.
洞穴的形成需要火山气体和热量的稳定释放，海拔高到足以防止每年的大量降雪在夏季融化。
2
The use of vibrant colors on the facades serves as a reflector to control heatemission and sunlight stream.
在外墙上使用鲜艳的颜色作为一个反射器，以控制热辐射和阳光。
3
Other fuels such as wood, biomass, shredded tires and sludge are also candidates, depending on their percentage ofheat input, moisture content and emission requirements.