Xishuangbanna borders on Laos, Myanmar and Thailand, with a long frontier line of 1069km.

与老挝、缅甸、越南接壤，国境线长1069公里。

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Haemocytes, as the frontier line of immune defence, play vital roles in the innate immune system of molluscans.

血细胞作为免疫防御的第一道防线，在软体动物的非特异性免疫系统中具有重要作用。

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The different ways of handling frontier line in oil painting works are the symbols of personalized art language and art style.

油画作品中边缘线处理方式各不相同，它是一种个性化艺术语言和艺术风格的标志性符号。

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What I did in this diagram is I computed the efficient portfolio frontier-- now it's the blue line with three assets.

在这张图表中,我计算了有效边界-,蓝色线表示三种资产的组合。

耶鲁公开课 - 金融市场课程节选

The pink line here is the efficient portfolio frontier when we have only stocks and bonds to invest.

这条粉色曲线就是有效边界,这个投资组合只包括了股票和债券。

耶鲁公开课 - 金融市场课程节选

But when that's not true, then there is a typical sort of modern frontier, a land bridge which there a line is-a theoretical line is drawn through it, and on one side is one city, and the other side is another city.

但还不止这些天然边界,另外还有种边界形式,和现代国境线很类似,是由一座陆桥,分割出一条界线…假象的界线,界线的一边是一个城邦,另一边是另一个城邦

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The British-drawn boundary between the two countries is disputed by Afghanistan, which doesn't recognize as an international frontier the so-called Durand Line that cuts through the ethnic Pashtun heartland.

WSJ: Afghan, Pakistani Forces Clash

There has been no official Pakistani comment on the latest clashes, but a Pakistani foreign ministry spokesman insisted that the Durand Line was the settled frontier, and that Pakistani checkpoints were vital for good border management.

BBC: Second Afghan-Pakistan border clash in a week

From Willow, where the race clock starts ticking, mushers and their dog teams will begin making their way through unforgiving wilderness toward the finish line in the old frontier town of Nome on Alaska's western coast.

NPR: Iditarod Kicks Off With Festive Ceremonial Start