内容要比正式教材含量大，积累了大量例句、练习和阅读资料，扩大了讲解范围，对教师和学员起到强化和辅导作用。
It has a carefully accumulated volume of sentences, exercises and reading materials, expanding the scope of your studies and serving to strengthen and guide both teacher and student.
第五是做一个视野开阔的孩子，要学会看书，学会思考，并通过广泛的阅读积累知识、扩大视野；
Fifthly, be a child with broad field of vision. Learn to read and think so as to accumulate knowledge and widen field of vision.
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