| 单词 | training wheel | 
| 释义 | Definition of training wheel in English:training wheelnoun ˈtreɪnɪŋ wiːl 
 OriginMid 19th century (in an earlier sense). Definition of training wheel in US English:training wheelnounˈtreɪnɪŋ wiːl 
 OriginMid 19th century (in an earlier sense).  | 
	
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