The report concluded, however, that the differences in reporting are unlikely to be the primary explanation for the United States' relatively low international ranking.

Burial customs are the primary explanation and solution of the problems faced by ghosts.

Yet there is little evidence to support this claim as the primary explanation.

Natural selection remains the primary explanation for adaptive evolution.

Indeed, the fact that big countries can field more effective armies than small ones is the primary explanation for why large nations became the norm.

There are two primary explanations for this effect.

After the Depression, the primary explanations of it tended to ignore the importance of the money supply.

I am inclined to think, however, that the primary explanation of these differences lies rather in his writing largely from memory.

The primary explanation for why anabolic steroid use has spread to children is the social environment in which youngsters are raised.

Two primary explanations were proposed for the expansion.