"unclear areas" is correct and usable in written English.
You can use it when you want to refer to things that are not clear or easily understood. For example: "The report addressed a number of unclear areas that need further investigation."
Each had responsibilities and roles to play in an emergency situation but there were some unclear areas of responsibility within this complex set of horizontal institutional arrangements, resulting in a fragmentation in authority (Clay et al. 1999: 16).
The sketch maps also stimulated questions about missing details; the 'blank spots' and unclear areas that indicated uncertainties and concerns with specific areas.
Shedding new and more light on these still unclear areas is an important part of the research focused on finding and describing the important relationship between PK and PD, such as clinical and microbiological outcomes.
Have someone who quilts proofread the student notes for typos or unclear areas.
However, lack of knowledge of foam-based shale fracturing and complex nature of two-phase foam, make it challenging to use in field conditions, and one unclear area is the effect of the foam flow rate on fracturing and fracture characteristics.
Its effectiveness remains unclear in areas with lower smartphone and online penetration.
The name Skåneland is first recorded in print in the year 1719 It is unclear what area is meant.
An unclear peripheral area of the lesion may reduce the effective FOV, cause eye fatigue, and result in difficulty in diagnosis and surgery.
Farmers and aid workers say rainfall has been more erratic and stormy for at least the past five years, though it is unclear whether any areas are getting more water overall.
In addition, the cumulative and long-term impacts of this form of natural gas drilling remain unclear, especially in areas where some gas naturally escapes from below ground.
The death toll from the original earthquake on Saturday could rise, as the situation is unclear in remote areas which remain cut off or hard to access.
