Laozi was stopped by frontier guards when leaving Hangu Pass for the west, let go after writing down Tao te Ching.

老子在西出函谷关时，被边防人员拦住，写下了《道德经》后才被放行。

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Laozi was stopped by frontier guards when leaving Hangu Pass for the west, let go after writing down Tao te Ching.

老子在西出函谷关时，被边防人员拦住，写下了《道德经》后才被放行。

youdao