九十

例句：

1. 1.I need to buy a ninety-dollar dress for the party.
   我需要买一件九十美元的连衣裙参加派对。
2. 2.The teacher asked us to write a ninety-page essay on the topic.
   老师要求我们写一篇九十分钟的关于这个主题的作文。
3. 3. Ninety percent of the students failed the exam.
   百分之九十的学生考试不及格。