ord.第九十
n.第九十，九十分之一
num.第九十

原形：ninetieth复数：ninetieths

The ninetieth birthday party was a grand celebration for Grandma.
九十岁的生日派对是祖母盛大的庆典。
She reached the ninetieth rank in her chess tournament this year.
她在今年的国际象棋比赛中取得了第九十名的好成绩。
After ninety years of marriage, they still held hands every day.
结婚九十年后，他们仍然每天手牵手。
He is the ninetieth person to sign up for the charity run.
他是报名参加慈善赛跑的第90个人。
Their house is on the ninetieth floor of the towering skyscraper.
他们的房子位于那座摩天大楼的第九十层。
The ninetieth anniversary of World War I is being commemorated worldwide.
世界大战一战的九十周年在全球范围内被纪念。
She was the first woman to climb Mount Everest in her ninetieth year.
她在九十岁时成为第一位登顶珠穆朗玛峰的女性。
The ninetieth chapter of the book is about the history of the city.
书的第九十章讲述了这个城市的历史。
They marked the ninetieth anniversary of their school's founding with a special event.
他们举办了一场特别活动来庆祝学校的九十周年校庆。
In the marathon, he clocked a time of just under ninety minutes.
马拉松比赛中，他以不到90分钟的成绩完成比赛。