1. 表明;说明;证明
    If you say that something illustrates a situation that you are drawing attention to, you mean that it shows that the situation exists.

    e.g. The example of the United States illustrates this point...
           美国的例子证明了这一点。
    e.g. This change is neatly illustrated by what has happened to the Arab League...
           这种变化鲜明地体现在阿拉伯联盟所发生的事件上。

2. (用例子、故事或图表)说明,阐明
    If you use an example, story, or diagram to illustrate a point, you use it show that what you are saying is true or to make your meaning clearer.

    e.g. Let me give another example to illustrate this difficult point...
           我再举个例子来说明这个难点。
    e.g. Throughout, she illustrates her analysis with excerpts from discussions.
           自始至终,她摘引讨论内容来阐明她的分析。

3. 给(书)加插图(或图表)
    If you illustrate a book, you put pictures, photographs or diagrams into it.

illustrate的意思

    e.g. She went on to art school and is now illustrating a book...
           她后来读了艺术学校,现在正在为一本书画插图。
    e.g. He has illustrated the book with black-and-white photographs.
           他为那本书配了一些黑白照片插图。