1 to explain or make sth clear by using examples, pictures or diagrams 用例子、图片或图表说明: These statistics illustrate the point that I was making very well. 这些统计资料把我要说的都说清楚了。

2 to add pictures, diagrams, etc to a book or magazine （为书或杂志）加插图: Most cookery books are illustrated. 大部份烹饪书籍都附有插图。