A fortress is easier to protect because it's simpler: it has no windows, few doors, no skylights, or vent systems through which an intruder might sneak.
堡垒的保护更容易因为它构造更简单：它没有窗口、几乎没有几道门，没有天窗或通风系统这些入侵者可能利用的东西。
All space is centered at large void holes, which has skylights on it.
所有空间以巨大的空洞为中心，空洞上面有天窗设计。
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