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adj.挑战性的;引起兴趣的;令人深思的;v.挑战,质疑(challenge的现在分词); 英英释义: challenging[ 'tʃælindʒiŋ ]adj.requiring full use of your abilities or resources"performed the most challenging task without a mistake"同义词:ambitiousstimulating interest or thought"a challenging hypothesis