... Bullhead bed 布尔赫德层 bullhead rail 双头钢轨 bullhead shark 宽纹虎鲨 ...
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N a rail having a cross section with a bulbous top and bottom, the top being larger 横断面有上大下小两鼓凸头的铁轨 (Now largely superseded by flat-bottomed rail) [railways]
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