| 单词 | plunger | 
| 释义 | plunger [`plǝn·jǝr]  DESIGN ENGINEERING A wooden shaft with a large rubber suction cup at the end, used to clear plumbing traps and waste outlets.  ELECTROMAGNETISM See <<piston>>  ENGINEERING See <<force plug>>  MECHANICAL ENGINEERING The long rod or piston of a reciprocating pump.  | 
	
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