The phrase "a primary mode of" is correct and usable in written English.
It can be used to describe the main method or approach through which something is done or achieved.
Example: "In modern education, technology has become a primary mode of delivering information to students."
Alternatives: "a main method of" or "a key approach to".
For centuries, as a primary mode of transportation, horses have helped shape our notions of personal freedom and independence.
In the related literature, transverse breathing cracks are considered as a primary mode of damage.
Telescoping (i.e., crushing of the bell-and-spigot) was a primary mode of failure that was observed.
As I watch the snail's-pace "evacuation" of potential victims of Hurricane Rita, I see once again the folly of our overdependence on the automobile as a primary mode of transportation.
Given the prominence of television as a presumptive artistic counterpart (or rival) to movies, there's less reason than ever to disdain small screens at home as a primary mode of watching films.
If Nagel is right, art itself would no longer be merely the scientist's leisure-time fulfillment but would be (I think, correctly) recognized as a primary mode of coming to grips with the mental and moral essence of the universe.
With a trigger multiplicity of ≥60 hits, corresponding to a primary mode energy of 2 TeV, the angular resolution of EAS measurements is < 1° for showers with more than 500 recorded hits.
From this new perspective, "secondary" eigenmodes are seen to replicate the propagation behaviour of a "primary" mode, so that DG's propagation characteristics can be obtained directly from the dispersion diffusion curves of the primary mode.
However, alterations in the citric acid cycle (TCA cycle), an assumed primary mode of action of MPP+, could not be unambiguously deduced from our standard metabolomics data.
Because of the many shortcomings of both systems, this iBrief concludes that the FDA should instead stop assigning center jurisdiction based on a product's "primary mode of action," and give the Office of Combination Products internal agency jurisdiction over combination products.
Many respondents (35/47, 74%) reported sometimes having difficulties in determining an outbreak's primary mode of transmission.
