| 1 | It was just midnight when they arrived at the Hangu Pass (in today's Lingbao County in Henan Province, which was the east gate of the State of Qin). | |
| 2 | Laozi was stopped by frontier guards when leaving Hangu Pass for the west , let go after writing down Tao Te Ching . | |
| 3 | When Laotzu saw the future of Zhou dynasty was to doom, he left Hangu Pass and left a book with five thousand Chinese characters named Tao-te ching . | |
| 4 | Taking the cross cave propping in Hanguguan Tunnel of passengers special line on Zhengxi railway, this paper introduces a new construction technique of propping- vertical propping method. |
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