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For example, the old- growth trees have extremely long roots that help prevent erosion of the soil along the banks of the many fish streams.
比如，這些古老的樹長著特別長的根，能夠幫助防止溪流兩岸的土壤被侵蝕，而這些溪流中都生活著很多魚。
Keeping these banks intact is important because these streams are home to salmon, which are the bear's main food source.
保持這些溪流兩岸不受損非常重要，因為在這些溪流中生活著熊的主要食物來源——鮭魚。
In return, the bear's feeding habits nurture the forest.
作為回報，熊的進食習慣也滋養著森林。
As the bears eat the salmon, they discard the skin and bones in great amounts on the forest floor, which provide vital nutrients.
這些熊在吃鮭魚的時候，會把大量的富含營養的魚皮和骨頭丟棄在森林地面。
These produce lush vegetation that sustains thousands of other types of life forms, from birds to insects and more.
在這些魚皮和骨頭被丟棄的地方會長出茂密的植被，供養著從鳥類到昆蟲等數千種其他類型的生物。
Today the spirit bear lives off the coast of the province of British Columbia on a few islands.
如今白靈熊生活在大不列顛哥倫比亞省的一些島上，遠離海岸而居。
There is great concern for their survival since it is estimated that less than two hundred of these white bears remain.
由于科學家估算現存的白靈熊不超過兩百只，它們的存亡引起了廣泛關注。
The best way to protect them is to make every effort to preserve the delicate balance of their forest environment - in other words, their ecosystem.
要保護它們最好的辦法就是努力維護它們生存的森林環境的微妙平衡，換句話說，就是要保護它們的生態環境。
The greatest threat to the bear's existence is the loss of its habitat.
白靈熊生存的最大威脅就是它棲息地的喪失。
Over many years, logging companies have stripped the land by cutting down a large number of trees.
多年以來，伐木公司砍倒了大批樹木，把土地變得光禿禿的。
In addition, they have built roads which have fractured the areas where the bear usually feeds and many hibernation sites have also been lost.
另外，他們還建造了許多公路，破壞了白靈熊經常進食的地區，還使它失去了很多冬眠的場所。
