求翻译：在教学上，老师给学生的知识必须是与时俱进的，网络教材正好解决了这点，因为网络教材是联网的。会不断更新。老师也可以在以往的教学方式上填入很多新的想法，比如可以制作成PPT，插入图片，把抽象的具体化，这更有利于教学目的的实施。是什么意思？

In teaching, teachers must give students the knowledge is advancing with the times, the online textbook just to solve this, because the network materials networked. Will be constantly updated. The teacher can fill in a lot of new ideas on the teaching methods in the past, such as can be made into a