To roll balls rapidly down a slope, signifying smooth, swift, and unimpeded movement or action; to proceed effortlessly and fluently without hindrance.
Era:
Ancient
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Story:
During the Tang Dynasty, Zhang Jiuling, the Minister of the Secretariat, was in charge of selecting talents for the Ministry of Personnel. He advocated for appointing people based on their abilities rather than strict qualifications, and established ten regional commissioners (interview envoys), which earned him the emperor's approval.
He not only skillfully assisted the emperor in handling state affairs but was also a talented poet. He was eloquent and articulate, always speaking fluently and incessantly when discussing classics, like balls rolling down a slope without any hindrance.