How many skills went into the making of the tint and the kilns, into supplying the heat, the light and power, the belts, motors, and all the other things a mill requires?
制造颜料，烘干需要的热量，照明，电力，传动带，电动机，一家工厂所需要的一切设备，等等，所有这一切需要多少技能？
To do this, the exterior finish has a dark tint, and the metal structure is completely detached from the skin to prevent heat loss.
为了达到这个目的，房屋外部涂有黑色涂饰，金属结构完全与外表分离，以防热量流失。
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