书是人类进步的阶梯,终生的伴侣,最诚挚的朋友怎么翻译

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Book is the step to process,a panion in the whole life and the most sincere friend
======以下答案可供参考======
供参考答案1:
book is the ladder of human progress, life-long partner, the most sincere friend.
the book is the ladder of human progress, is a life-long partner, but also my most sincere friend.
供参考答案2:
Books are the ladder of the progress of mankind, life partner, the most sincere friend