每门课程都进一步分为多个单元，每个单元都有学习资料（PDF文档），并且提供了自我评价的方法。
Each course is further divided in modules, each module coming with study material (a PDF document), and offers the option for self-assessment.
孩子们的书籍以及学习资料都十分基础，还分成了很多的小单元——如果你时间紧张，这会比你翻一本厚厚的笔记本简单多了。
Children's books and learning materials start with the basics and break them down into small fragments-and when you're pressed for time, that can be much easier than getting into a dense workbook.
孩子们的书籍以及学习资料都十分基础，还分成了很多的小单元——如果你时间紧张，这会比你翻一本厚厚的笔记本简单多了。
Children's books and learning materials start with the basics and break them down into small fragments-and when you're pressed for time, that can be much easier than getting into a dense workbook.
应用推荐