Gǔrén chēng běifāng qúnshān wéi tiānxiàjǐ, qìshì xióngwěi.
The ancients called the northern mountains the 'backbone of the realm' for their commanding grandeur.
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A literary epithet applied to China's great northern ranges - the Taihang, the spine of the North China Plain. The metaphor treats the country as a body and the mountains as its spine.