| 单词 | final frontier | 
| 释义 | Definition of final frontier in English:final frontiernoun 
 OriginMid 19th century: popularized by its use in the opening of the US television series Star Trek. Definition of final frontier in US English:final frontiernoun 
 OriginMid 19th century: popularized by its use in the opening of the US television series Star Trek.  | 
	
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