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challenging


adj
difficult in an interesting or enjoyable way
 Teaching young children is a challenging and rewarding job.
 a challenging problem
>challenginglyadv
1. Testing and challenging of ideas is encouraged.
    学生往往并不总是对的;他们应作好准备,迎接挑战。

2. As it happens, we don't plan to live in America. It was challenging enough going there on vacation.
    我们幸好不打算住在美国, 但要到那里去度假也是够恼人的。

3. Instead of the FUD factors, what you want is the NICE factors — new, interesting, challenging experiences."
    你所需要的东西是NICE因素-- NICE是 指新的、使人感兴趣的、有挑战性的经历-- 而不是FUD因素。"

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