Then he secretly constructed the most important part of the building, the roof beam that would hold the roof together.

然后，他私下造好了工程中最重要的部分–支撑整个屋顶的大梁。

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You can see that I broke a wooden beam, a pipe, a board, another part of the roof, and a window.

你可以看出我破坏了一个木质的横梁，一根管子，一片木板，以及屋顶的另一些部分，还有窗户。

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At last they got to the point of installing the roof beam.

最后，工程进行到安装屋顶大梁这一紧要步骤了。

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Basements provide good protection if equipped with a suitable door and a concrete roof, but basements of pier-beam houses would leave their occupants exposed and vulnerable if the structure above them were blown away, said Ernst Kiesling, a former professor of civil engineering at Texas Tech.

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