求翻译：4.1.2采暖居住建筑的楼梯间及外廊应做保温封闭，楼梯间宜采暖，入口处应设门斗等避风保温设施，外门应设闭门器，楼梯间出屋面门或人孔盖板应做保温处理。是什么意思？

4.1.2 heating residential buildings stairwell and verandahs should do the insulation enclosed stairwell should heating, should be located at the entrance door fighting sheltered insulation facilities, exterior doors should be located behind closed doors, the roof door or manhole cover in the stairwe

4.1 .2heating residential buildings, the staircase and Gallery should be closed to keep warm, and staircase at the entrance to heating, door should be located as typhoon-warm facilities should be located outside door, behind closed doors, staircase, or the roof door hole covers should be done with w

4.1.2 verandah and staircase of heating residential buildings insulation should be done closed stairwells should be heating, should be located at the entrance foyer, shelter insulation facilities, outer doors shall be located behind closed doors, staircase roof door or manhole cover heat preservatio