The phrase "important and efficient" is correct and usable in written English.
Whenever you want to emphasize that something is important and efficient, you can use it. For example: This new computer model is both important and efficient because it has high performance with minimal energy consumption.
In crystal engineering, modification of the crystal structure by cation substitution is one of the most important and efficient methods.
Conjugate gradient method is an important and efficient method to solve the unconstrained optimization problems, especially for large scale problems.
Absolute test is one of the most important and efficient techniques to saperate the reference surface which usually limits the accuracy of test results.
In order to solve Eq. (1), we apply the HAM in fuzzy case as an important and efficient method to find the solution of differential equations.
Immunolocalization is an important and efficient tool in studies involving the understanding of genome organization and analysis of the structure and function of chromosomes.
Fault and fracture conduit systems are commonly important and efficient in delivering dolomitizing fluids to the overlying strata, thus causing extensive dolomitization (Qing and Mountjoy 1989).
An investment of this magnitude would require careful consideration to ensure that other important, effective and efficient services were not displaced.
The association between the extent of muscle regeneration and its functional output indicates how important prompt and efficient regeneration following injury is if proper muscle function is to be maintained.
If such a process could be industrialized, it would represent an important new and efficient method of bioethanol production.
Sankaranarayanan et al 31 showed previously that adequately trained nurses can be used to deliver colposcopy and cryotherapy services and are important, reliable and efficient alternate human resources.
Successfully implementing clinical guidelines and changing practices to reflect current evidence is an important goal and efficient tools are needed to achieve that goal [ 11].
