I am a introversion.

我是一个内向。

We all know the subject of his introversion.

我们都知道他性格内向的话题。

Extroversion was adopted rather than introversion.

外向型获得通过，而不是内向。

Then I was changed from introversion to extroversion.

我的性格从此由内向转变成外向。

The Introversion Test: Personality Characteristics of introverts.

内向性格测试：个性特征。