他用小刀把自己的名字刻在树皮上。
她绕着它的树干转圈，一只手按在树皮上，诉说着过去一年的遗憾和未来一年的计划。
She walks circles around its trunk, one hand on the bark, releasing regrets from the old year and planning for the new one.
写下的手稿在中世纪被用来教学，写在白桦树皮和棕榈叶上，直到16世纪出现印刷机为止。
While written manuscripts were used for teaching in medieval times, they were written on birch bark or palm leaves, until the advent of the printing press from the 16th century.
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