In truth, I am at a loss for any better explanation.

"At present I am unable to come up with a better explanation."

"But you can get a better explanation from someone else."

The scientists could offer better explanations when things went wrong.

For lack of a better explanation, they're more country than anything.

So she had no choice but to believe him, at least until someone provided a better explanation.

"I think I'm going to need a better explanation than that."

"I'd like to hear a better explanation of where he was tonight."

I would have to find a chance to give him a better, less ugly, explanation, later.

In both cases, however, there's a better explanation for what happened.