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.

youdao

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.

youdao

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.

youdao

You don't have to do this for Wednesday but let's say for next Monday, and that is: I'd like you to memorize a short poem by Yeats or by Frost, either one.

你们不用今天做,下星期一吧：,我想让你们背一首短诗,叶芝或者弗罗斯特的都行。

耶鲁公开课 - 现代诗歌课程节选