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.
知识的流动不再只是由北向南、由西向东、由富向穷。
The flow of knowledge is no longer North to South, West to East, rich to poor.
有着戍边传统的哥萨克人带领着一只由狩猎者、流浪汉和河盗组成的队伍向东进发。
Cossacks, traditional frontier defenders, led an eastward charge of hunters, vagabonds and river pirates.
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