书籍是人类进步的阶梯，是宝贵的精神财富。
As we know books are the ladder of human progress and the valuable spiritual wealth.
高尔基先生说过：“书籍是人类进步的阶梯。”
正如高尔基所说，“书籍是人类进步的阶梯”。
As Gorky once said, "Books are the stepping stones to human progress."
但是书籍是人类最忠实的朋友，是人类进步的阶梯。
However, books are faithful friends of mankind and steps to human progress.
书籍是人类文明的标志之一，是社会不断进步的阶梯。
Books are a hallmark of human civilization and a ladder for continuous progress of society.
书籍是人类文明的标志之一，是社会不断进步的阶梯。
Books are a hallmark of human civilization and a ladder for continuous progress of society.
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