Public Speaking tip: Does your audience know what you just said?

Well do they?
No I'm not asking if they were distracted.
I'm asking, Could they hear you?
Breath is what allows you to project your voice.
Did they hear each word?
Articulate each word, so that they know what you said. Make sure your pronunciation works for your audience. Do they relate to your colloquialisms and sayings?
Explain abbreviations and acronyms or at least make sure their context ensures they are understood.
Don't lose the audience before they even have a chance to be distracted, and you will if they don't even know what you said.