The White House says President Biden is fine after he fell over during a military graduation ceremony.

白宫表示，拜登总统在一次军事毕业典礼上摔倒后，目前情况良好。

One of his last public performances before his death was with the Marine Band at a yearly military ceremony.

他死前最后一次公开表演是在一年一度的军事仪式上与海军乐队一起演出。

With an increasing number of festivals, feasts, military ceremonies, and religious celebrations to keep track of, Romans needed a calendar to organize all of them.

随着节日、宴会、军事仪式、和宗教庆典的数目增加，为了要记得所有重要日子，罗马人需要制定日历来安排这些事项。