challenging
[ˈtʃæləndʒɪŋ]
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);
例句:
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Has any difficult or challenging content been clearly signposted?
来自BBC
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Weber is challenging his audience to question their own beliefs.
韦伯正要求观众们反思质疑各自的信仰。
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Try tennis, badminton or windsurfing. In short, anything challenging.
试试网球、羽毛球或帆板运动吧。总之，只要是有挑战性的。
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Many enjoy the mental stimulation of a challenging job.
很多人喜欢富有挑战性的工作所带来的强烈的精神刺激。
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It will be challenging to stay at the top.
来自BBC
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The climb is challenging Do we take the kids?
来自THETIMES