n. the cardinal number that is the product of ten and nine
s. being ten more than eighty
num. 九十, 九十个
1. She is ninety years old today.
她今天九十岁了。
2. The book costs ninety dollars.
这本书售价九十美元。
3. We will meet at nine o'clock, not ninety.
我们九点钟见,而不是九十点。