精准计算3d跨度公式简介：As long as we are flexible and move step by step, it will definitely not be easy for the little devils to catch us in such a building with more than ten floors, unless they blow up the whole building!
As long as we are flexible and move step by step, it will definitely not be easy for the little devils to catch us in such a building with more than ten floors, unless they blow up the whole building!
