A good tip is to pick people out and look at them for around five seconds. Not looking at the audience gives the impression that you're either not interested in them or terrified of them.

一个很好的建议是挑一些人，看着他们大约五秒钟。不看观众会给人留下这样的印象：你要么对他们不感兴趣，要么对他们感到恐惧。