那块我们驻扎的石头靠倚的是一个奇迹，它三十尺高而底部也有三十尺，差不多是个完美正四边形，而扭曲的树木拱盖在它上面并往下窥视我们。
That rock we were camped against was a marvel it was thirty feet high and thirty feet at base, a perfect square almost, and twisted trees arched over it and peeked down on us.
秦皇岛体育场屋盖由24榀悬臂桁架组成，桁架之间以弧形拱梁和钢索连接为空间稳定体系。
Qinhuangdao stadium roof system is composed of 24 cantilever trusses. The truss, arc beams and cables form together a steady space system.
复旦正大体育馆钢屋盖是由空间桁架、钢拱和索组成的受力比较复杂的索-桁架结构。
The steel roof of Fudan Zhengda Gymnasium, a kind of cable-truss structure, is a complicated (pressed) system made up of space truss, steel arc and cables.
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