多听少说。 语法要正确。 完整念出单词。 避免短信或者网络语言。 坚守自己知道的东西。 要引经据典。 使用“聪明”的语言，这样能留下极好的印象。 用行动介绍自己。 别变成“万事通”。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
As the saying goes, "Better to remain silent and be thought a fool than to speak out and remove all doubt." If you want to assumed reasonably smart, keep your mouth shut. Talk less and when you do talk, what you say will be valued that much more. It helps that "smart" people are generally viewed as more introverted, as inaccurate as that is. Not only will you have the benefit of the doubt, but you'll have the stereotype on your side, too. "Mama said I dun need none no book learnin'. Now gid off