When you trace a pencil on a piece of paper, these layers are cleaved, leaving thin layers of these carbon sheets.
当你用铅笔在纸上划写的时候，这些碳原子薄层裂开并留在纸上。
Volume I, 1920, was produced laboriously with pencil and carbon paper.
第一卷于1920年出版，那是我用铅笔和复写纸辛辛苦苦地搞定的。
Volume I, 1920, was produced laboriously with pencil and carbon paper.
第一卷于1920年出版，那是我用铅笔和复写纸辛辛苦苦地搞定的。
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