山海关是万里长城的起点，是中国最著名的古战场。
Shanhaiguan or the mountain and sea pass, where the Great Wall begins, is a famous ancient battleground in China.
长城是中国古代著名的军事防御工程，是划分农业文明和游牧文明的人文界线，但它同时也是重要的自然界线。
The Great Wall is not only a famous military defence in the ancient China, but also a cultural boundary line, which distinguishes the agriculture civilization from the nomadic civilization.
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