进化的脊椎动物的背部就像一个水平杆，内脏就悬挂在这水平杆上。
The backs of vertebrates evolved as a kind of horizontal pole under which guts were slung.
安装顺序，立杆沿桥纵向由一端向另一端，水平杆由下向上进行。
The installed order is done along the longitudinal direction of bridge to the vertical bars and to the horizontal bars from below to top.
对于连墙杆、长水平杆、剪刀撑，必须在脚手架拆卸到相关跨门架后，方可拆除。
For even the wall bar, long horizontal pole, scissors, you must remove the scaffolding to the relevant inter-mast only after the demolition.
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