The sparse distribution of the feathers, however, also allows considerable lateral air movement over the skin surface, thereby permitting further heatloss by convection.
然而，羽毛的稀疏分布也使得皮肤表面形成相当大量的侧向空气流动，从而可以通过对流进一步散热。
2
If you use firebricks round the walls of the boiler, the heatloss. Can be considerably reduced.
炉壁采用耐火砖可大大降低热耗。
3
If you use firebricks round the walls of the boiler, the heatloss, can be considerably reduced.