| 单词 | bumper | 
| 释义 | bumper [`bǝm·pǝr]  ENGINEERING 1. A metal bar attached to one or both ends of a powered transportation vehicle, especially an automobile, to prevent damage to the body.  2. In a drilling operation, the supporting stay between the main foundation sill and the engine block.  3. In drilling, a fishing tool for loosening jammed cable tools.  METALLURGY A vibrating machine for ramming and consolidating sand into a mold.  | 
	
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