Vault: in building construction, an arched structure forming a ceiling or roof.

拱顶：房屋建造中用拱作成的天花板或屋顶。

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Part One, "Arched structure and its Evolution: an Analysis", in three chapters, focuses on this structure's application to different genres and its forms in different historical periods.

上篇“对拱形结构形态及演变的分析”共有三章，主要论述拱形结构在各种体裁音乐作品以及各历史时期的体现形态。

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Arched-corrugated metal roof( ACMR) belongs to cold-bending thin wall steel structure, of which the stability is a key factor influencing its bearing capacity.

金属拱型波纹屋顶结构属于冷弯薄壁构件，稳定问题是影响其承载能力的关键因素。

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The two-arched stone and brick structure carries a public bridleway to the New England heritage site.

BBC: New England's Donkey Bridge shut as floods leave it unsafe