| 单词 | port stopper | 
| 释义 | > as lemmasport stopper   port stopper  n. U.S. Nautical (now historical) a shutter for closing a port, esp. a gun port. ΚΠ 1863    N.Y. Times 24 June 6/1  				The fourth shot..struck a port stopper in the centre, breaking it in two. 1863    Sci. Amer. 29 Aug. 135/3  				The Ironsides..has received two 10-inch shot on her port stoppers, and even there they only made indentations. 1995    Monitor Turret Gunnery (was Re: Ironclad Ques) in  sci.military 		(Usenet newsgroup)	 23 Jan.  				Theport stopper was then opened and the turret rotated until the target came intoview. < as lemmas  | 
	
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