I did not wait for him to speak, but at once began to explain my presence.

They should be here within a few hours, and I would rather not have to explain my presence.

What else could explain her presence now, in his car?

Not the whole truth, but enough to explain his presence.

They try to run away and explain their presence at the same time.

"But you might have explained your presence in the first place."

Even if someone showed up, he could explain his presence.

He'd never had to explain his presence so many times on one mission.

Later, he tried again to explain the presence of the photographs.

"Until now, we knew of no theory that could explain their presence."