The phrase "a extremely narrow" is not correct in English.
It should be "an extremely narrow." You can use the corrected phrase when describing something that has a very small width or extent.
Example: "The path was an extremely narrow passage that only allowed one person to walk through at a time."
Alternatives: "a very narrow" or "a highly restricted".
In carrying out this procedure, we are ensuring that we don't accidentally miss a extremely narrow ring or mistakenly identify a "false" ring boundary as a real one.
The above methods are limited to a extremely narrow frequency range and more recent researches have continued to overcome this limitation, leading to novel class of acoustic metamaterials so called "space-coiling metamaterials" having negative refractive index over broad range of frequency [43 48].
Unlike other crops for which a extremely narrow genetic basis is reported in cultivated material after resequencing, such as cereals [ 19], or tomato [ 50] some of the sweet melon groups still retain significant levels of diversity.
A key difficulty is the detection of a contribution arising from an extremely narrow region, since the DW width typically extends only over a few atomic cells.
Twice a middle turbinate was completely removed (once because of a concha bullosa and once because of an extremely narrow approach), and twice a partial removal of a bullous middle turbinate (lateral part) was performed.
Despite the stratospheric price tag, the rent is, in an extremely narrow sense, a bargain.
The child's young mother was a small woman with an extremely narrow birth canal.
"The problem we have is that the extreme tyre has an extremely narrow window.
They may have now a second chance, within an extremely narrow window of opportunity, to resurface the economic evidence on the long-term impact of the UK's exit from the European Union.
Roy Cooper, the Democratic candidate, won a highly contentious election by an extremely narrow margin.
Lenses can capture varying amounts of the scene before them from a very wide angle to an extremely narrow view.
