decide what main points are absolutely necessary
and then limit your talk to these points.
the biggest difference between spoken
and written language is that readers can look back over printed words when they don't understand.
with spoken language,
however,
listeners can't go back
and check the word.
they have to rely on memory.
this means that an oral report can't deliver as much information as a written report.
that is,
you can't have as many pieces of information packed into the same number of words.