在门形框架顶部使用一个横撑相连。

The portal frames are joined at the top by a cross member.

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约束的形式有采用螺杆和门形钢板两种。

There are two types of restraint-screw rod type and frame plate type.

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每个房间后面都有一个55加仑的鼓形炉，前面有一个门，后面有个带两个管道的烟囱洞。

Behind each chamber is a 55-gallon-drum stove with a door on the front and a chimney hole with two pipes in the back.

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