If you use something as an illustrative example, or for illustrative purposes, you use it to show that what you are saying is true or to make your meaning clearer.
例句
A second illustrative example was taken from The Observer newspaper...另一个说明性的例子摘自《观察家报》。The following excerpt is illustrative of her interaction with students.接下来的节选部分可以说明她与学生的互动情况。