Challenging

['tʃælɪn(d)ʒɪŋ] or ['tʃælɪndʒɪŋ]

解释:

(adj.) disturbingly provocative; 'an intriguing smile' .

(adj.) stimulating interest or thought; 'a challenging hypothesis'; 'a thought-provoking book' .

克拉丽斯编辑--From WordNet

解释:

(p. pr. & vb. n.) of Challenge

埃斯特拉编辑