The phrase "a number of doubts" is correct and usable in written English.
It can be used when expressing uncertainty or questions about a particular topic or situation.
Example: "After reviewing the proposal, I have a number of doubts regarding its feasibility and potential impact."
Alternatives: "several concerns" or "a few questions".
A number of doubts dog the business.
However, a number of doubts and concerns regarding QD regimens have been raised, as the experience is limited.
The Stamina case, for example, raises a number of doubts about how we may be able to reduce the gap between radically diverging framings of regenerative medicine.
This reality raises a number of doubts about neoliberal claims.
There are a number of doubts and disadvantages to Dunford's plan in light of the fact that 10 times that many NATO soldiers in Afghanistan over the last 12 years failed to produce stability.
He released a preliminary report on 10 September 1997, and an interim report on 9 January 1998; while these reports did not come to a conclusion about Lyons' guilt, they did raise a number of doubts about his testimony.
Well into the board meeting at which Ms. Hudson was appointed, a number of governors doubted that the academy was the place for her as well.
One possible reason for low participation could have been that a significant number of doubts and concerns were clarified during the prior community information sessions (n = 196).
When I made the modest but exciting (at least to me!) discovery, a number of questions and doubts crossed my mind.
A number of scientists expressed doubts about Theranos early on, while more cautious investors tend to avoid medical companies unless their core product has been rigorously tested and peer-reviewed.
However, there are a number of arguments and doubts raised by politicians, negotiators and environmentalists alike with regard to the necessity of implementing adaptation in parallel with mitigation.
