thirtieth [ˈθɚtiɪθ]

例句:

• The present crop of books and documentaries about Marilyn Monroe exploit the thirtieth anniversary of her death.
  时下出现的这些有关玛丽莲·梦露的书和纪录片是借她逝世30周年之际推出的。
  
• For my thirtieth birthday, my friends clubbed together and bought me a watch.
  为庆祝我30岁生日，朋友们凑钱给我买了块表。
  
• A day is about one thirtieth of a month.
  一天大约是一个月的三十分之一.
  
• Except now you have one thirtieth of the problem.
  来自SA
• This is the last page of my thirtieth-birthday present.
  来自NEWYORKER
• Now in its thirtieth year, the band continues to evoke the glory days of eighties thrash metal.
  来自NEWYORKER