to draw pictures for a book, magazine, etc.

a beautifully illustrated book/old manuscript 配有精美插图的书／旧手稿

to show the meaning or truth of something more clearly, especially by giving examples

The lecturer illustrated his point with a diagram on the blackboard. 讲师在黑板上用图表来说明自己的观点。

This latest conflict further illustrates the weakness of the UN. 最近的这次冲突进一步说明了联合国的软弱。

[ + question word ] The exhibition will illustrate how life evolved from water. 这次展览将展示生命是如何从水中演化而来的。