big roof area 空顶区
The smelter, owned by Met-Mex Peñoles, part of a big Mexican mining group, ran without a roof from 1901 until 2000, blanketing the surrounding area with layers of fine black powder.
这家冶炼厂归Met-Mex Peñoles所有，它是一个大的墨西哥矿业集团的一部分，1901年建厂时它连厂房屋顶都没有，到2000年该厂把周围的地区盖上了一层层细的黑色粉末。
The roof of the whole complex is transformed into a big community garden that becomes the fifth façade of the project – a common area of orchards, infinity swimming pools and sports facilities.
整个综合体的顶层成为了一个巨大又整体的花园，同时也是这个项目第五种类外立面，花园里有公共的阳光果园，有无边界的游泳池，还有很多的运动设施。
Roof falling of rock bolting supported tunnel is usually paroxysmal in a big area, so safety monitoring is of great importance.
锚杆支护巷道顶板冒落具有突发性和冒落面积大的特点，安全监测非常必要。
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