许和刘都被视作行业顶尖，但这并没有阻止他们不断努力变得更好。

Both Xu and Liu are considered to be the best, but that hasn't stopped them from always trying to become better.

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在某些方面，许教授很像运动员刘翔。

In some ways, Professor Xu is like the sportsman Liu Xiang.

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刘询承皇位以后，立许妃做皇后。

After Liu Xun ascended the throne, he made Imperial Concubine Xu his queen.

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