They questioned whether the building had been adequately fortified, telling CBS News a trailer was being used as an office, with 12ft (3.7m) steel-reinforced concrete barriers to shield it.
https://feedx.net，这一点在WPS下载最新地址中也有详细论述
DigitalPrintPrint + Digital。关于这个话题，搜狗输入法下载提供了深入分析
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Diagrams from redesign 2, using Excalidraw[3]