求翻译：所以在这个时候对学生在这方面的知识进行扩展和巩固就显得水到渠成。而且在学生们的现实生活中，培养他们了解地图和区别方向的能力尤其重要。61课就是关于这个知识的扩展。是什么意思？

So at this time to expand students ' knowledge in this area and to consolidate it is ripe. And the students in real life, develop their understanding of maps and ability are particularly important in the direction of the difference. Lesson 61 is on the expansion of knowledge.