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。Letters are convenient for illustrating stylistic range.书信文字便于说明文体变化的范围。The example is chosen solely for its aptness in illustrating the current pet theory of the critic.选择这个例子仅仅是因为它能说明这位评论家目前最钟爱的理论。