| 单词 | bottom gear | 
| 释义 | Definition of bottom gear in English:bottom gearnoun ˌbɒtəm ˈɡɪə 
 OriginMid 19th century (in an earlier sense). From bottom + gear. Definition of bottom gear in US English:bottom gearnounˌbɒtəm ˈɡɪə 
 OriginMid 19th century (in an earlier sense). From bottom + gear.  | 
	
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