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单词	arduous
释义	ar·du·ous (ärj-əs) adj. 1. Demanding great effort or labor; difficult: "the arduous work of preparing a Dictionary of the English Language" (Thomas Macaulay). 2. Testing severely the powers of endurance; strenuous: a long, arduous, and exhausting war. 3. Hard to traverse, climb, or surmount. [From Latin arduus, high, steep.] ardu·ous·ly adv. ardu·ous·ness n.
随便看	royalist royal jelly Royall royally royalmast royal mast royal palm royal poinciana royal purple royal-purple royalty royal we Roy David Roy Ellsworth Roy Marcus RP RPG R plasmid rpm rps RQ R & R RR RRB -rrhagia

英语词典包含135693条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。