首先，相对于海滩松在西海岸的连续分布，短叶松仅呈零散的块状分布。
The first is that jack pines occur in patchier stands than the continuous swaths of lodgepole on the west coast.
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。
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.
尽管北美短叶松的气孔对轻度干旱胁迫不如黑云杉敏感，但是它对中度及严重干旱胁迫的敏感程度却高于黑云杉。
Despite less sensitive to mild drought stress in jack pine than in black spruce, stomata was more sensitive to moderate and severe stress in jack pine than in black spruce.
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.
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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