The phrase "a very challenging one" is a correct and usable phrase in written English.
You can use this phrase to describe a task or situation that is difficult and requires a lot of effort. For example, "Writing an essay on a complex historical event proved to be a very challenging one."
The control problem of Autonomous Underwater Vehicle (AUV) is a very challenging one since the mathematical model of AUV is characterized by high nonlinearity, strongly coupling and time-varying features.
"Although this has been a painful experience, I am confident that the availability issues are well on track to being resolved and the margin benefits from the consolidation will flow through". Mr Brick said the year ahead for retail would be "a very challenging one".
It is a very rewarding job, and a very challenging one.
If a Republican is elected president of the United States and Islamophobia continues to escalate, the post-Obama era is going to be a very challenging one.
42 Despite these moderate to high heritabilities, the fracture phenotype is a very challenging one for use in genetic studies because fracture risk is influenced by a number of diverse physiologic factors, including BMD and age-related declines in bone microarchitecture and quality, muscle strength, balance, cognition, cardiovascular function, and vitamin D status.
The most polite will say the date is a "very challenging" one to hit, but that is as optimistic as they get.
"But it is a process and it is a very, very challenging one".
No, not his down there one, but another very challenging one – the multicultural, multiproblem, multi-everything, inner-city area in east London where Adam does his best to watch over his shabby little flock.
Blackcomb has more intermediate runs, while Whistler has very challenging ones on the upper glacier.
Perhaps it was the inherent good manners of the Cambridge-Boston arts community, but most of the questions -- every one of which Mr. Gioia praised for its intelligence -- were on the order of "what do you think of European arts support systems?," or "how do you tour a 15-ton sculpture?" Plausible questions, but not very challenging ones.
"I think [Boone Isaacs] is in a very challenging position, but also in one to provoke widespread programmatic change within the academy," said Stephane Dunn, director of the Cinema, Technology and Emerging Media Studies program at Morehouse College.
