The phrase "a key gap" is correct and usable in written English.
It can be used to refer to an important or significant deficiency or lack in a particular context, such as research, knowledge, or resources.
Example: "The study revealed a key gap in our understanding of the effects of climate change on local ecosystems."
Alternatives: "a crucial deficiency" or "an essential void".
"Today's rules will fill a key gap in the regulatory landscape," Mary L. Schapiro, the agency's chairwoman, said at a public meeting in Washington.
The scientists said this "fills a key gap" between the earliest human skeletal remains and the earliest dated stone and bone Aurignacian tools and weapons.
A key gap remains collecting robust information on PWS performance.
A key gap is that these methods have not taken energy consumption into account when selecting the optimum LSPs.
National Statistician Jil Matheson said that the absence of a UK-wide official private rental index was a "key gap" in data on the housing market.
Etzione et al. [7] indicate that learning relationships that are not expressed by verbs is a key gap in current Open IE state-of-the-art methods.
Western blot analysis and immunofluorescence showed a marked decrease of key gap and adherens junction proteins (connexin43 and N-cadherin, respectively) in mice subjected to severe septic injury.
These thermodynamic data provide a key missing gap in the understanding of the Cu Cl cycle of thermochemical hydrogen production.
Addressing a key knowledge gap in modular VLP engineering, this study investigates the underlying fundamentals affecting the ability of induced antibodies to recognize the native pathogen.
This research fills a key knowledge gap by examining: 1) The influence of different types of criminal activity (e.g., property vs violent crime) along different segments of a person's travel route; 2) The influence of bicycle and pedestrian collision data in combination with criminal activity on sustainable and active travel choices.
"Ecosystems are likely going to have to face multiple dimensions of climate change in the future -- increases in average temperatures, no-analogue conditions -- but understanding how they will respond to variability is also a key knowledge gap".
