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层中的层 以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译 - 1
If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material. 如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。 - 2
Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer. 由于寒冷的气温，冻土带有两层：最上面的一层被称为活动层，在冬季和春季被冻结，但在夏季解冻。 - 3
The nutrients are deep down in the active layer anyway, not high up near the surface, which is the part of the active layer most affected by run-off. 不管怎样，营养物质存在于活性层深处而不是在表层附近，活性层受径流影响最大的地方。
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