威尔逊对美国独特性的理解（美国例外论）和对边疆学说的接受影响着他对美国在世界事务中作用的看法。
His understanding of America's unique and acceptance of frontier theory has a great influence upon his concept of America's role in world affairs.
我希望在地球上最后留存的蛮荒要塞之一——野生世界的边疆消失之前亲身体验一下。
I wanted to witness one of Earth's last wild 17 strongholds-a feral frontier-before it's gone.
并且，此一时期边疆史地研究呈现出的空前的忧患意识和世界性意识，具有鲜明的时代特征。
The historio-geographical studies of the frontiers exhibited unprecedented consciousness of misery, crisis and world awareness with distinctive characteristics of the times.
并且，此一时期边疆史地研究呈现出的空前的忧患意识和世界性意识，具有鲜明的时代特征。
The historio-geographical studies of the frontiers exhibited unprecedented consciousness of misery, crisis and world awareness with distinctive characteristics of the times.
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