n. sheet iron
... cement sheath 水泥环 ; 水泥壳 ; 洋灰环 Steel Sheath 钢皮 ; 钢护套 rubber sheath 橡皮护套 ; 橡胶护套 ; 橡皮套 ...
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铸钢皮带轮，壁厚不匀，热节点多，补缩通道狭窄，很难用设置冒口的方法给予补缩。
Cast steel pulley with wall unevenness, many hot pitch points and narrow feeding channel is difficult to be fed by setting up a head.
它本身的钢皮像一个“硬壳”结构一般负载，从而降低附加的梁柱所需的成本。
The steel skin itself takes the load like a "Monocoque" structure thus cutting cost for additional columns or beams.
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