阶梯 - Wiktionary

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階梯- Wiktionary

書籍是人類進步的階梯。 [MSC, trad.] 书籍是人类进步的阶梯。 [MSC, simp.] Shūjí shì rénlèi jìnbù de jiētī. [Pinyin]: The book is the ladder of human progress.