These are meant to be illustrative.
这些都是为了做。
At the sound of footsteps Swithin beat a hasty retreat up-stairs, where he struck a light, and revealed a table covered with books and papers, while round the walls hung star-maps, and other diagrams illustrative of celestial phenomena.
听到脚步声,斯威森匆忙撤退到楼上,他点了盏灯,露出一张桌子,上面放满了书籍和文件,墙上挂着星图和其他天体现象的图表。