Would the product be considered essential, a must-have?
Estimating the construction cost of a tunnel with certain diameter and length during the planning stage of a project is essential and a "must do" to justify the project, but it is a very difficult task.
An essential guide and a must-read!
Good lighting is an essential must.
Finally, an essential must have is the equipment.
Essential Oil of Lavender is a must in a first aid kit, this does not seem to be common knowledge but it can be used to sooth minor burns very effectively.
Therefore, an essential question must be: Coupled to nonideal effects, can the fast reconnection process develop and be eventually realized in space plasmas?
It is an essential problem must to face how to raises the computer major student's project design and development ability to meet the stern employment competition situation.
A species' essential trait must occur in all the members of a species for the entire life of that species.
In her review for Sing Out!, Kari Estren said "Paul's Essentials is just that and a must for your folk collection".
The national list of essential medicines must play a role in ensuring that the injectable medicines included are limited to the minimum so that unnecessary injections can be avoided.
