Textbooks taught us knowledge, and extra-curricular you can book at our homes to show to the circumstances of our colorful world, which teach the knowledge of our people is our mentor.

• 课本教给我们知识，而课外书则可以在我们足不出户的情况下展现给我们多姿多彩的世界，从而教给我们做人的知识，是我们的良师益友。