The birch bark used to be used to write on as paper because the boys then were used to writing on it.

 
  • 桦树皮过去常常被用来作纸张写字,当时的孩子们已习惯了在桦树皮上写字。
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  • 深远海浮式风电平台 - deep-sea floating wind power platform
  • 京雄高速公路 - Beijing-Xiongan expressway
  • 农业及相关产业增加值 - the added value of agriculture and related industries
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