YOU can't go from a nervous speaker to a star speaker overnight. You shouldn't expect to. Give yourshlf time to get used to large audience. Start with smaller groups and get as much feedback as you can. keep on practicing and developing your skills.

  Be familliar with your speech materials.That doesn't mean menorizing your speech which can lack enthusiasm and naturalness.Know your key talking points supporting details and ways to move from one point to the next.

翻译

你不可能一夜之间从一个紧张的演讲者变成一个明星演讲者。你不应该期望。给自己一些时间去适应大量的观众。从较小的小组开始，尽可能多地获得反馈。继续练习，提高你的技能。

熟悉你的演讲材料。这并不意味着背诵你的演讲，因为那样会缺乏热情和自然。知道你的主要谈话要点，支持细节，以及从一个点转移到下一个点的方法。

词汇

go from 从……开始

expect to 期待

get used to 习惯

start with  从开始

as much 一样多

keep on 继续下去

lack enthusiasm  缺乏热情、怕事

talking  points    话题

move from 从……移动

point to  指向、针对