The first is that jackpines occur in patchier stands than the continuous swaths of lodgepole on the west coast.
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。
2
Jackpines cross the boreal forest of northern Canada, stretching all the way to the East Coast and down into the United States.
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。
3
Some scientists say it is inevitable that the tree-killing insect will spread all the way east via a corridor of jackpines across northern Canada's boreal forest.