ninthly

例句：

1. 1. The book was published on the ninth day of the month.
   这本书在月份的第九天出版。
2. 2.She arrived at the airport on the ninth day of her trip.
   她在旅行的第九天到达了机场。
3. 3.The team worked diligently for the ninth day without a break.
   团队在第九天勤奋工作，没有休息。