A transverse bar joins the two posts.
一根横杆连接着两根立柱。
The pillars gave way and a section of the roof collapsed.
这些立柱坍塌了，一部分屋顶坠落下来。
They rigged up a tent-shaped scaffold directly above the tip of the horizontal column, with pulleys suspended from the scaffold's apex.
他们在水平立柱的顶端正上方安装了一个帐篷状的脚手架，在脚手架的顶端悬挂滑轮。
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