| 单词 | once-only | 
| 释义 | Word Frequency once-only(ˌwʌnsˈəʊnlɪ) adjective  never to be repeated   This is a once-only offer.  this once-only opportunity to select one of these books absolutely free  Membership is valid for ten years for a once-only donation of £2,500.  | 
	
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