Preventing centaurs from invading China

During the Ming dynasty, China was frequently attacked by centaurs from north. In order to ward off the invaders, the emperor of China wanted to build a long stretch of barrier along the mountain ranges.

However, this barrier must be easily accessible for the people from the north while preventing access for the centaurs. Therefore, I am designing an unique Great Wall of China which can't be scaled by the likes of centaur. I need a barrier that can be crossed by humans and not centaurs.

What type of entrance would be impossible for a centaur-like creature to pass through, yet be passable for a regular human being?

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Preventing centaurs from invading China

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