如果你对某一动作不确定，查询专业书籍或认证教练。
If you are unfamiliar with any posture, consult with a book or certified teacher.
阅读专业书籍当然必要，但主要为了今后职业的需要。
It is quite necessary to read books of specialized area, which is mainly the preparation for the need of a profession in the future.
当然，大学中或专业录领域内的大部分知识传递是通过专业书籍，而不是传统教科书进行的。
Of course, much of the knowledge transfer at universities and in professional Settings happens through professional books, not traditional textbooks.
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