The phrase 'key for understanding' is correct and can be used in written English.
You can use this phrase to emphasize how important it is to understand something. For example: The combination of education and experience is a key for understanding the complexities of the job market.
The dimensionality of the maze is a key for understanding its complexity.
Its soluble carbonaceous component, dissolved BC, is the key for understanding many geological and environmental processes of BC.
Determining the properties of tidal debris is key for understanding the evolution of these galaxies and other tidally disturbed systems.
Innovation is his key for understanding his own work, which he said he had long viewed as a series of disparate episodes, not a career arc.
Subglacial deformation and water-pressure cycles as a key for understanding ice stream dynamics: evidence from the Late Ordovician succession of the Djado Basin (Niger).
The meaning attributed to different levels of sports performance was key for understanding the differences in compromising behaviour.
Further transdisciplinary efforts are clearly needed to address this link, key for understanding how plant populations 'move' across changing landscapes.
Ten years later, Cayley's projective metric provided a key for understanding the relationship between the various types of non-Euclidean geometries.
The chemical behavior of oxide species at cathode in molten carbonate is a key for understanding the process of cathode reactions.
This is important, because it may serve as a key for understanding this disorder, as well as for designing better medicines.
The results suggest that the key for understanding the effect of the welfare state lies in the institutional design in the level and distribution of social rights.
