It's not high mountains and deep valleys that best serve to defend a country.
固国不以山溪之险。
They often have high hills and deep valleys.
他们一样平常有下山深谷之上。
For twelve hundred miles the Great Wall ran over high mountains and deep valleys.
这座长城翻高山，越低谷，长达一千二百英里。
For twelve hundred miles the Great Wall ran over high mountains and deep valleys.
这座长城翻高山，越低谷，长达一千二百英里。
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