This clump of paper birch trunks was backlit by a blaze of reds and yellows.

这一丛纸桦树树干的背光是一片红黄相间的火焰。

How were paper birch and Douglas fir communicating?

纸皮桦和花旗松到底是怎么交流的呢？

Birch of western United States resembling the paper birch but having brownish bark.

美国西部的一种桦树，类似于纸皮桦，但是树皮棕色。

Paper birch is the best of the hardwood, often running in bursting strength up to 80% and in tearing strength up to 90% of spruce pulp.

白桦通常是比较适合的阔叶木，其浆料的撕裂度可以达到云杉浆的80%，耐破度可以达到云杉浆的90%。

We found that birch bark could serve as paper.

我们发现桦树皮可以作纸用。