difficult in an interesting way that tests your ability挑战性的；考验能力的
challenging work/questions/problems具有挑战性的工作／提问／问题
I have had a challenging and rewarding career as a teacher.我从事过富有挑战性且非常有意义的教师职业。
Synonyms difficultdifficult
hard
challenging
demanding
taxing
These words all describe something that is not easy and requires a lot of effort or skill to do.
difficultnot easy; needing effort or skill to do or understand:
The exam questions were quite difficult.考题相当难。
It is difficult for young people to find jobs around here.年轻人要在附近找到工作很难。
hardnot easy; needing effort or skill to do or understand:
I always found languages quite hard at school.在学校读书时我总觉得语言很难学。
It was one of the hardest things I ever did.这是我做过的最难的事情之一。
difficult or hard?用 difficult 还是 hard？Hard is slightly less formal than difficult. It is used particularly in the structure hard to believe/say/find/take, etc., although difficult can also be used in any of these examples.
challenging(approving) difficult in an interesting way that tests your ability.
demandingdifficult to do or deal with and needing a lot of effort, skill, etc.:
It is a technically demanding piece of music to play.演奏这一段音乐需要有很高的技艺。
taxing(often used in negative statements) difficult to do and needing a lot of mental or physical effort:
This shouldn’t be too taxing for you.这对你来说不至于太费劲。
Patterns
difficult/hard/challenging/demanding/taxing for somebody