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His aim was to improve the efficiency of the open fire by the use of lumps of fireclay and by a canopy, both designed to increase the amount of radiant heat. 他通過(guò)爐蓋和火泥塊的使用來(lái)起到改善敞開(kāi)的爐子的傚率的目的，這兩項(xiàng)設(shè)計(jì)提高了熱輻射量。