背景简介：武器分为不可升级武器和可升级武器两种。
Background introduction: weapon is divided into non-upgrading and upgrading.
首先是以莫扎特生平与作品创作背景简介为出发点，阐明了莫扎特人生观的确立及其音乐创作所产生的影响。
Firstly, beginning with the background of Mozart's life and his works, it elaborates how his view on life was formed and the effect on his music creating.
他还提供了每个作者的简介，提供了每一本书的背景以解释书的意义所在。
He also provided biographical information on each author, and attempted to explain why each book is relevant, placing it in a larger context.
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