九日的用法和樣例：
例句
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古羅馬歷中自三、五、七、十各月的十五日起算的前第九日即三、五、七、十各月的第七日；其它各月的第五日
The ninth day before the ides of a month; in the ancient Roman calendar, the seventh day of March, May, July, or October and the fifth day of the other months. -
嫌疑犯在七月九日做了什麼事情？
What did the suspect do on July ninth? -
這裡摘登一封＇親愛的愛畢＇的回信，刊登在一九七三年三月九日的＇費城公報＇上。
Here is a letter adapted from DEAR ABBY, Philadelphia Bulletin, March9,1973.
