Both Xu and Liu are considered to be the best, but that hasn't stopped them from always trying to become better.
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。
In some ways, Professor Xu is like the sportsman Liu Xiang.
在某些方面，许教授很像运动员刘翔。
After Liu Xun ascended the throne, he made Imperial Concubine Xu his queen.
刘询承皇位以后，立许妃做皇后。
Apart from them, two other accomplices Liu and Xu also participated in a number of robbery cases.
除了他们之外，另外两名同伙许某和刘某也参与了多起抢劫案件。
Yang X. -L. , Jiang G. -Y. , Xu L. -L. , Liu Y. -M. Safety evaluation of intra-articular sodium hyaluronate for the treatment of chondromalacia patellae.
杨晓莲，姜贵云，徐丽丽，刘亚梅黏弹性材料玻璃酸钠关节腔填充治疗髌骨软化症的安全性评价。
Yang X. -L. , Jiang G. -Y. , Xu L. -L. , Liu Y. -M. Safety evaluation of intra-articular sodium hyaluronate for the treatment of chondromalacia patellae.
杨晓莲，姜贵云，徐丽丽，刘亚梅黏弹性材料玻璃酸钠关节腔填充治疗髌骨软化症的安全性评价。
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