By using the mechanics theory to analyze the character of roof moving and deformation after coal mining, the conclusion is gotten that the basicroof will not fail.
Even in the 70s we had a basic solar water system on the roof, and grew fruit and vegetables.
即便在70年代，我们就在屋顶安装了一套基础的太阳能热水系统，并种上果树和蔬菜。
3
Slums should be turned into livable places where residents have the opportunity to build a "decent roof over their head" and basic amenities like water and sanitation, she says.