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邊界;邊境
A frontier is a border between two countries.
例句
It wasn't difficult then to cross the frontier.
那時(shí)穿越邊境并不困難。
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西部邊疆,邊遠(yuǎn)地區(qū)(指 20 世紀(jì)前美國(guó)西部歐洲移民尚未定居的部分)
When you are talking about the western part of America before the twentieth century, you use frontier to refer to the area beyond the part settled by Europeans.
例句
...a far-flung outpost on the frontier.
遠(yuǎn)駐西部邊疆的前哨
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(尤指知識(shí)的)前沿，尖端，新領(lǐng)域
The frontiers of something, especially knowledge, are the limits to which it extends.
例句
...pushing back the frontiers of science.
推進(jìn)科學(xué)前沿
...technological frontiers.
技術(shù)尖端