那时，他们的生活依赖于森林的自然资源，尤其是桦树。
Back then, their lifes depended on the natural resources of the forests, especially the birch tree.
关山的森林覆盖率达到了36.56%以上，主要树种包括：桦树、白杨树、椴树。
The mountain forest coverage rate is 36.56% , main species including birch , poplars , lime tree .
他们对这些新来的人在农业耕作和森林环境知识方面加以指导，教他们认识玉蜀黍、豆子、西葫芦、槭糖、雪地鞋、长雪橇和桦树皮独木舟。
They instructed the new-comers in their agriculture and woodcraft, introduced them to maize, beans, squash, maple sugar, snowshoes, toboggans, and birch bark canoes.
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