Germany is bounded on two sides by natural barriers.

德国的两边是天然屏障形成的边界。

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Given these natural barriers, it's a wonder that Wikis ever succeed.

考虑到这些自然的障碍，wikipedia依然成功了，这真是个奇迹。

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Trees, bushes and smaller plants can act as natural barriers along streams and rivers.

树林，灌木和较小的作物可以作为小溪和河流旁边的天然屏障。

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In lab tests, researchers at Case Western Reserve University School of Medicine were able to overcome these natural barriers.

BBC: NEWS | Health | How BSE may have infected humans

And then it has two natural barriers: the Denny Street overpass, on one side, and the interstate 5 corridor, on another.

NPR: Homeless Alcoholics in Seattle Find a Home

The Brighton Beach area is sheltered from treacherous tides by the natural barriers of Breezy Point, in Queens, and Sandy Hook, N.

WSJ: Brighton Beach: Brookyln's Swimming Mecca