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Say majority of the audience are not conspicuous to the common language that is basically in practice. They are from different backgrounds, here say language issue, and the speaker has to execute the presentation that is acknowledged by all.
first of all , i will use the english language since it is a language speaken almost by all cultures and civilastions , i will try to reformulate my ideas with simple words so that even those who doesn't have a good level in english could understand .and if i find it difficult i will use some help by someone who will traduce what i say in other languages so that my ideas get to every body.