| 单词 | proof-butt | 
| 释义 | > as lemmasproof-butt   proof-butt  n. ΚΠ 1840    Times 4 Sept. 5  				On Friday last a party of the Royal Artillery..proceeded to the proof butt in the Royal Arsenal, Woolwich..for the purpose of trying a plan..for discharging large pieces of ordnance with a hammer and detonating powder. 1866    Sci. Amer. Sept. 213/2  				Last August four Palliser guns were tested with perfect success at the proof butt in the Royal Arsenal at Woolwch. 1907    Daily Chron. 3 Jan. 7/1  				A serious accident..at the proof butts on Plumstead Marshes. 2002    Herald 		(Glasgow)	 		(Nexis)	 19 Oct. 16  				The tests were made in the naval proof butts at Portsmouth. < as lemmas  | 
	
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