书是人类进步的阶梯 Book human ladder of progress ; Human ladder of progress
书籍是人类进步的阶梯 Books are the stepping stones to human progress
人类进步的阶梯
The ladder of human progress
以上为机器翻译结果，长、整句建议使用 人工翻译 。
书是我们的朋友，书是人类进步的阶梯。
Books are our friends and the means to our human growth.
youdao
书是人类进步的阶梯。
Books are the ladder of human progress.
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.
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