• 1. fifteenth: 第十五 | 正月十五 | 海节
• 2. hilbert's fifteenth problem: 希尔伯特第十五问题
• 3. Festival of the fifteenth day: 中元节

更多释义

• 1.He received a car on his fifteenth birthday.
  他在十五岁生日时收到了一辆车。
  dict.yoduao.com
• 2.He got two birthday cakes on his fifteenth birthday.
  他十五岁生日时得到了两个生日蛋糕。
  dict.yoduao.com
• 3.The fifteenth century saw big progress in printing technology in the west.
  15世纪西方印刷术有了很大进步。
  dict.yoduao.com

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