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				| The Weiyuan Fort's lower hidden wall hole with Humen Bridge fully in sight |  
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				| Prof. Ching-chih Chen visit the Weiyuan Fort with Humen Bridge at the background |  
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				| Introduction to the 4000 sma-jin front-bore cannon at Weiyuan Fort |  
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				| Prof. Ching-chih Chen visit the Weiyuan Fort with Humen Bridge at the background |  
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