The shearing work of two mutually twisted flat screw wires is a key link in the design of rhombic metal mesh weaving machines.
两根互绕扁螺旋钢丝的剪切作业是菱形金属网编织机设计中的关键一环。
"The rollercoaster is wooden and so unlike rides made from iron and steel there was always a chance of the odd nail or screw that would not be entirely flat," he said.
奥尔说：“这个过山车道不是由钢铁制成的，它是木制的，由此，有可能有旧钉子或者螺丝翘起造成轨道的不平坦。”
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