罗伊登说，这个地区在地质上极其不寻常，因为在东部的四川盆地和西部的托比坦高原之间的边界上有非常陡峭的斜坡。

The region is extremely unusual geologically, Royden says, because of the very steep slopes at the boundary between the Sichuan Basin to the east and the Tobetan plateau to the west.

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在秘鲁安第斯山脉东部的马丘比丘古城遗址中，可以看到世界上一些最精美的石头建筑。

Some of the world's finest stone architecture can be seen in the ruins of the ancient Inca city of Machu Picchu high in the eastern Andes Mountains of Peru.

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在构造上，青海位于泛凯西斯山脉群的中西部和特提斯东部的北部。

Qinghai is tectonically in the mid-western part of the Pan-Cathysian Block Group and the north part of eastern Tethys.

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We'll start in the east of London, which is traditionally the cheapest area of London.

我们将从伦敦东部开始，那是传统意义上最便宜的地区。

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