Authentic material is always used in this book. The readings are unsimplified chapters from textbooks and other sources with which university students must become familiar.
本书采用的材料真实可靠，阅读材料来自于未经简化的原版大学课本或是大学生们所必须熟知的材料。
Authentic material is always used in this book. The readings are unsimplified chapters from textbooks and other sources with which university students must become familiar.
本书采用的材料真实可靠，阅读材料来自于未经简化的原版大学课本或是大学生们所必须熟知的材料。
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