Would you please give a brief account regarding his life after Sākyamuni attained Buddhahood?
释迦牟尼成佛后的事迹，可以简略地谈一谈吗？

There are different versions regarding the age at which Sākyamuni attained enlightenment, some quote it as thirty and some as thirty-five. For fifty (or forty-five) years after that, until the end of his life at the age of 80, he never stopped preaching his doctrine. He traveled widely, preaching to the public the truth he had perceived. At the outset, he went to Benares (P. Bārāṇasī) to look for his five departed followers and preached the truth to them. The first sermon of the Buddha is called "the initial turning of the wheel of Dhamma" (S. Dharmacakra pravartana, P. Dhammacakkappavattana) in Buddhism.
释迦牟尼成佛的年龄，也有不同的记载，有的说三十岁，有的说三十五岁。此后五十年（或四十五年）中，直到他八十岁逝世前，他没有间断过他的说法工作。他到处游行，向大众宣示他自己证悟的真理。他最初到波罗奈城去找离开了他的五个侍者，为他们说法。佛教把佛陀第一次说法，叫做“初转法轮”。