They build them as cooling towers, to keep the temperature of the colony on the inside at an optimum 30 degrees centigrade, and they are remarkably efficient, normally accurate plus or minus a single degree.

它们建造这些土堆是当作冷却塔用的，以保持领地内部的温度始终在最佳的30摄氏度，这些冷却塔非常有效、精确，通常温度的变化只有上下1度。