一些科学家认为，这种林业害虫，不可避免地会借由加拿大北部针叶林带中的短叶松走廊，迅速向东扩散。
Some scientists say it is inevitable that the tree-killing insect will spread all the way east via a corridor of jack pines across northern Canada's boreal forest.
短叶松穿过了加拿大北部针叶林带，并一路延伸到东海岸，直到美国。
Jack pines cross the boreal forest of northern Canada, stretching all the way to the East Coast and down into the United States.
一些科学家认为，这种林业害虫，不可避免地会借由加拿大北部针叶林带中的短叶松走廊，迅速向东扩散。问题是：这种情况具体将在何时发生？
Some scientists say it is inevitable that the tree-killing insect will spread all the way east via a corridor of jack pines across northern Canada's boreal forest.
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