The core is contained within a building that has solid concrete walls, 3-to-6 feet thick.
核心被包含在一个有坚固的，3 - 6英尺厚的水泥墙的建筑中。
Cutting machine is the core equipment in production of aerated concrete.
切割机是加气混凝土生产中的核心设备。
Cutting machine is the core equipment in production of aerated concrete.
切割机是加气混凝土生产中的核心设备。
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