| 词汇 | buckle up | 
| 释义 | buckle up  phrasal verb with buckle verb uk/ˈbʌk.əl/ us/ˈbʌk.əl/  US informal (UK belt up)系紧安全带  to fasten the belt that keeps you in your seat in a car or a plane  Don't forget, buckle up before you start driving. 别忘了开车前系好安全带。  | 
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