然后根据井组储量计算原理，确定了内部井不需要外扩，边井和角井需要外扩的原则。

Then, with the reserve calculation principle, it was certain that the interior wells need not extending while edge wells and corner wells need extending.

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最后的话：有些帆船设计者有一方案解决舷内舷外发动机之争——在船舱和船底中设计一口井，在其内部安装一台舷外发动机。

A final word: some sailboat builders have resolved the debate between inboards and outboards by designing the cockpit and hull with a well in which an outboard is mounted.

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前方的内部庭院角落上四个楼梯井也保证了整体的结构稳定性和抗震性能。

The four stairwells located in the corners of the former inner courtyards also ensure the bracing and seismic stability of the whole.

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