| 单词 | pretravel | 
| 释义 | > as lemmaspretravel   pretravel n.  Brit.  , U.S.   (the amount of) movement of a working part of a mechanism that occurs before a point of action is reached (cf. overtravel n.); frequently attributive.ΚΠ 1965    Wireless World Sept. 464/2  				Pre-travel plunger movement is 0.050 in and up to 0.010 in overtravel is possible. 1966    Vision Res. 6 647  				The RT [= reaction time] was timed by closure of a microswitch with calibrated pretravel of 0–6 mm performed by flexion of the right thumb. 1983    Buck & Hickman Catal. 1983–5 369  				Has a special operated drive permitting plenty of over-travel and pre-travel as a stroke counter. 1999    Appliance Manufacturer 		(Nexis)	 1 May 49  				During actuation, pretravel is achieved when an overlay on top of the switch is first deformed to come into contact with the button. 2000    Tooling & Production 		(Nexis)	 1 Feb. 60  				Low pretravel variation..means measurements can be performed with equal precision from any direction. < as lemmas  | 
	
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