桦树皮很柔韧，很容易弯曲。

Birch bark is pliable and very easy to bend.

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我们发现桦树皮可以作纸用。

We found that birch bark could serve as paper.

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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.

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在全球经济一体化的今天，鄂温克族的桦树皮文化正面临着危机和挑战。

In the present society of global economic unification, however, it is endangering and facing challenge.

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树是银色树皮的桦树，一共四棵。

The trees were silver birches, four of them.

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树是银色树皮的桦树，一共四棵。

The trees were silver birches, four of them.

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