Birch bark is pliable and very easy to bend.
桦树皮很柔韧，很容易弯曲。
We found that birch bark could serve as paper.
我们发现桦树皮可以作纸用。
The birch bark culture is an component part of the primitive human culture.
桦树皮文化是人类原始文化的组成部分。
The birch bark culture is an component part of the primitive human culture.
桦树皮文化是人类原始文化的组成部分。
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