| 单词 | laborious | 
| 释义 | Word Frequency laborious(ləˈbɔːrɪəs) adjective 1.  involving great exertion or long effort  2.  given to working hard 3.  (of literary style, etc) not fluent  Derived formslaboriously (laˈboriously) adverb laboriousness (laˈboriousness)  noun | 
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