The two steel beams that support the upperroof are supported by only two points - the existing road and the column that rises at the bottom of the site.
支撑屋顶的两支钢梁仅由两点支撑——已有的路边和从基地地面抬升出的支柱。
2
The comparison between wind action only on the upperroof surface and both on the upper and lower roof surfaces, shows that the latter condition is more advantageous.
Seats on the upper deck of a London bus are seen open to the elements after the bus had its roof blown off in Eversholt Street, London, Thursday, July 7, 2005.