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.
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.
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。
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