钢环选用10#、08F、304、316、316LD等各种优质材料，适用的最高温度是600度。
这些木板——每块长8米——将由不锈钢绳索吊在周围树上的钢环上。
The boards - each measuring eight metres in length - will be attached to a steel ring suspended from surrounding trees by stainless steel cables.
进入磨机的粗料压碎于辊和钢环之间。
Coarse material entering the mill is crushed between the ring and rollers.
塔由五个直径大约30ft的圆形钢环组成。
The tower consists of five circular steel rings, approximately 30 feet in diameter.
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