1. 丹顶鹤：极乐鸟 a bird of paradise | 丹顶鹤 red -crowned crane | 山鸡 pheasant

2. 仙鹤：recuperative burner==同流换热炉 | red-crowned crane==仙鹤 | reforming gas boiler==转化气废热锅炉

6. red-crowned crane什么意思