The engine was series of mirrors which concentrate the sun's energy on a tube of water to create steam. 发动机用一系列的镜子把太阳能聚在一管水里制造蒸汽。
Because of water's latent heat capacity, a tubful of water placed in a greenhouse on a night of freezing cold will act as a reserve supply of heat. 因为水的这种潜热容量,在滴水成冰的夜晚置于温室中的一管水可起到保温热源的作用。