The new study found increasing death rates of several kinds of forests, like pine, fir and hemlock. The higher rates were observed among trees of different ages and sizes.

这项新研究发现几种林木的死亡率正在上升，比如松树，冷杉和铁杉。不同树龄和不同大小的树都被发现有较高的死亡率。

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Soon a dark wall of trees-red spruce, balsam fir, beech, hemlock-surrounds you, and there's a sudden stony persistence.

很快你会被一堵厚厚的树墙包围——红云杉、香脂冷杉、山毛榉和铁杉，这会持续一段时间。

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Soon a dark wall of trees—red spruce, balsam fir, beech , hemlock—surrounds you, and there's a sudden stony persistence.

很快你会被一堵厚厚的树墙包围——红云杉、香脂冷杉、山毛榉和铁杉，这会持续一段时间。

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The western slopes (below 1, 200 meters above sea level) are dominated by douglas fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla).

UNESCO: Biosphere Reserve Information