| 单词 | pump plunger | 
| 释义 | > as lemmaspump plunger   pump plunger  n. the piston of a pump (see plunger n. 2a). ΚΠ 1849    J. Weale Rudim. Dict. Terms Archit.  i. 103/1  				The ball of the clack is raised from its seat by the stroke of the pump-plunger forcing the water against it. 1889    P. N. Hasluck Model Engineer's Handybk. 61  				To give the pump-plunger a travel of 5/	8 in. 1990    W. A. Livesey GCSE Motor Vehicle Stud. iii. 30/1  				The underside of the piston therefore acts as a pump plunger, forcing the fresh charge in the crankcase up and through the transfer port into the cylinder. < as lemmas  | 
	
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