The fears that surround public speaking tend to fall into a few categories, said Linda Blackman, founder of Executive Image, a Chicago-based company that helps people make presentations.

• 据一家在芝加哥专门帮助人们如何演讲的公司ExecutiveImage的创办人LindaBlackman说，围绕着公共演讲的恐惧往往分为几大类。