The questions asked on slides should be in depth order from easy- no brainer facts to difficult - "dig out" the black hands behind the stage
sentences be short, precise, but sharp
vocies be firm with reasonable volumn.
Do not choose too emotional words ( eg. use strongly disagree, unacceptable, cannot tolorate, avoide use words like " that sucks, stupid, shit..."), Do not become emotional too early.
Lead discussions in the direction you want.
in one word, 打动你的听众, 而不是你自己