Napoleon thought the natural frontier was the Pacific Ocean.

而拿破仑认为自然疆界是太平洋。

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The Guangxi Zhuang Autonomous Region which is famous for its beautiful natural scenery is near the frontier between China and Vietnam.

以其美丽的自然风光而闻名的广西壮族自治区位于中越边境附近。

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Yunnan province in southwestern China's territory, is a natural resources frontier province.

云南省地处于中国版图的西南边疆，是一个自然资源大省。

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Napoleon thought the natural frontier was the Pacific Ocean.

而拿破仑认为自然疆界是太平洋

耶鲁公开课 - 欧洲文明课程节选

There is surrounding farmland going as far,typically, as there is either a natural or an artificial frontier.

周围环绕着农田,这些农田一般会延伸至一个自然边界,或者一个人工边界为止

耶鲁公开课 - 古希腊历史简介课程节选

Teddy Roosevelt, during his epic 1913-14 trip down the Amazon's uncharted River of Doubt, sought unbounded natural frontier.

WSJ: Riding Brazil's River of Doubt

Although this might seem suspiciously of-the-moment, given the number of designers currently mining Americana heritage, for the 33-year-old Minnesota native, the frontier-meets-luxe look is a natural fit.

WSJ: Ode to Handsome