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Từ điển American Heritage Dictionary 4th
arduous
ar·du·ous (ärʹjo͞o-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. See Synonyms at burdensome. See Synonyms at hard. [From Latin arduus, high, steep.] arʹdu·ous·ly adv.arʹdu·ous·ness n.
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