The phrase "are primarily explained in" is correct and usable in written English.
You can use it when discussing the main sources or contexts in which certain information or concepts are detailed or clarified.
Example: "The theories of relativity are primarily explained in Einstein's original papers."
Alternatives: "are mainly detailed in" or "are chiefly described in".
This assertion is likely to have been based on the finding that individual differences in reading are primarily explained by genetic differences between individuals.
The differences in gas emissions among the sites were primarily explained by differences in the availability of oxygen in the substrate.
The low level of RTW in our cohort is primarily explained by differences in the populations.
In the current study, results of the Blinder-Oaxaca decomposition suggest that the rural-urban gap in child malnutrition in Yemen is primarily explained by the difference in the magnitude of the determinants of child nutritional status (covariate effect is dominant), rather than by differences in their effect.
These sex discrepancies were primarily explained by differences in scores among those with depression rather than among those without depression.
Sex discrepancies were primarily explained by differences in scores among those with depression rather than among those without depression.
Changes in the abundance and fractionation of the various metals can be primarily explained by the shift in the geochemical regime from oxic acidic to reducing-circumneutral conditions, combined with the enrichment of reactive Fe near the soil surface.
This demonstrates that variability of frontopolar cortex patients in multitasking is primarily explained by the size of the lesion in BA 10 and that the size of the left BA 10 lesion is a good anatomical predictor of multitasking but not of dual-task related errors.
This demonstrates that variability of frontopolar cortex patients in multi-tasking performance is primarily explained by the size of the lesion in BA 10.
Thus, variability of frontopolar cortex patients in multi-tasking performance is primarily explained by the size of the lesion in BA 10.
