... bull-head pass 辊身平孔型 bull-head rail 圆头钢轨 A bull head 牛头 ...
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bull head rail 工字钢轨
N a rail having a cross section with a bulbous top and bottom, the top being larger 横断面有上大下小两鼓凸头的铁轨 (Now largely superseded by flat-bottomed rail) [railways]
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