The book also has a full answer key to all exercises.
这本书也有一个完整的答案主要向所有演习。
This is the key to singing - learning about the art, doing practical exercises, and by listening to others who have a well-trained voice.
这是学习唱歌的唯一途径。 培养艺术感，做实际练习，听那些训练有素的歌手演唱。
E. is a key phase to the formation of the habit of physical exercises.
学校体育阶段，则是体育锻炼习惯形成的关键期。
E. is a key phase to the formation of the habit of physical exercises.
学校体育阶段，则是体育锻炼习惯形成的关键期。
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