You should assert yourself more.

他断言人性决不会变。

How do you assert yourself in the face of an ignorant peer?

那么，如果与一位无知的同事共事，你会怎么表达自己？

You know how to assert yourself under pressure, and have developed your talent for effective communication through dramatic delivery and clever use of words.

你知道如何在压力之下振作强大起来，进而透过语言的聪明运用及表达方式，发展出了有效沟通的才能。