| 单词 | plain sail | 
| 释义 | Definition of plain sail in English:plain sailnoun Nautical 
 OriginMid 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. Definition of plain sail in US English:plain sailnoun Nautical 
 OriginMid 18th century; earliest use found in Philosophical Transactions of the Royal Society of London.  | 
	
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