More than half the surface of Brazil is covered by rain forest. So it's only fitting that the World Cup should have a stadium smack in the middle of it, right?
巴西半数以上的国土被热带雨林覆盖，所以，在该国热带雨林中建起一座体育场很顺理成章，对吧？
Viewed from the top, it looks as if the stadium is covered by a gray net of steel, and it look just like a birds nest made of tree branches.
从顶部看，体育馆好像被浅色的钢筋网覆盖，就像用树枝编织成的鸟巢一样。
A roof structure with steel tubular truss in one stadium is taken as a research object in this article, and some aspects of static and dynamic performance are covered.
本文以实际工程中某体育馆的钢管桁架屋盖结构为研究对象，对其静动力性能进行研究。
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