This suggests that learning theory can only explain part of the reason behind prejudice.

Two observations on the vocabulary may explain part of the problem.

"And the weather can be used to explain only part of it."

Genes appear to explain only part of the risk for developing these disorders.

I agree that work explains only part of the cause.

Shifting among plans explains only part of the cost savings.

But three factors can explain part of the overall rise.

Perhaps that explains part of it: if you can quit, why stay?

But that really explains only part of why he is here.

These same reasons can explain part of the look's appeal to males as well.