If there is no such pass, calvery from the north would easily get through from here and mount an invasion to the Beijing plain.
如果不在这里修城筑关，北方的入侵骑兵可以一直到达这里，居高临下攻入关内平原地带。
If there is no such pass, calvery from the north would easily get through from here and mount an invasion to the Beijing plain.
如果不在这里修城筑关，北方的入侵骑兵可以一直到达这里，居高临下攻入关内平原地带。
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