《旧唐书·列传·卷一百一十六》
 比如今年春游城南时，与足下在马上一同游戏，于是各诵清新艳丽的小律，不混杂其他体裁诗篇，从皇子陂回昭国里，此唱彼和，二十余里不绝吟诵之声。
如今年春游城南时，与足下马上相戏，因各诵新艳小律，不杂他篇，自皇子陂归昭国里，迭吟递唱，不绝声者二十里余。
For example, when we went for an outing south of the city this spring, we ambled together on horses, and each one recited fresh and beautiful short poems. We did not mix poems with other genres. We returned from the Huangzi Pond to the Zhaoguo neighborhood, singing in turn and answering each other; our singing never stopped for more than twenty li.