是ninety。
ninety 英[ˈnaɪnti] 美[ˈnaɪnti]
n. 九十
adj. 九十的；九十岁的
num. 九十
短语：
1.NINETY COUNTY 九十郡
2.Ninety degrees 露脊鲸
3.Ninety Night 九十个夜晚
4.Ninety Ah 九十啊
5.Lesson Ninety 第九十课
6.Ninety Million 九千万
7.NINETY LIMITED 玖十有限公司
8.ninety dolphins 九十只海豚
9.Ninety students 九十个学生
例句：
1.It was decided she had to stay another ninety days.
已经决定了，她不得不再呆90天。
2.Her grandfather is Her grandfather is a healthy ninety .
她祖父现年90岁，仍很健康。
3.Tomorrow's high will be eighty to ninety .
明天最高温度将达80度至90度。
4.Yes, it looks like he entered . . . ninety seconds ago.
是的，看样子他进去了... ...九十秒之前.
5.For example, many of the photos I take with my digital cameras are rotated ninety degrees, as they are taken as portraits.
例如，我用数码相机所拍摄的许多照片都旋转了九十度，因为我是把相机竖过来拍摄它们的。
6.Sherlock was a male baboon who, at the age of twenty-four, was about ninety in human terms.
夏洛克是一头二十四岁的成年雄性狒狒，按人类年龄来算，他已有九十岁。
7.For Jerusha and the ninety-odd other children in the orphanage, the first Wednesday of every month was quite a torturous day.
对洁茹以及孤儿院里其他九十几个院童来说，每个月的第一个礼拜三是一个十分难熬的日子。
8.Seventy miles per hour, ninety, a hundred and twenty and faster still.
时速七十英里、九十英里、一百二十英里，越飞越快。