In order to speak, at least as we understand speech, sound must move through air.

I'd long since lost the ability to understand human speech.

He could understand her speech a little better, now that they had spent time together.

She didn't say anything, probably couldn't even understand his speech.

Were we to remain here, while they left, you would not be able to understand local speech.

The King, however, appeared to understand our speech well enough.

I did not realize at the time, however, that only one person was able to understand my speech.

We no longer avoided one another; and by now I could understand his speech rather better.

"Sure and I see why you're after doing it this way, is all," he said, as if she could understand his speech.

I do not understand your speech, although the emotion behind the words came through clearly.