它由一个围壁组成，三边被封住。
This system consists of an enclosure, closed in on three sides.
此外，钢围壁与彩饰钢板之间 设置有绝缘层；
In addition, insulating layers are arranged between the steel trunk bulkhead and the decorative steel plates;
它们被瓶装，但也只有这么多压力那脆弱的围壁可以承受。
They are bottled up, but there is only so much pressure which frail walls can take.
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