n. the cardinal number that is the sum of seventeen and one
s. being one more than seventeen
num. 十八, 十八个
1. She will turn eighteen next month.
她下个月将满十八岁。
2. There are eighteen students in our class.
我们班有十八个学生。
3. I bought eighteen apples from the market.
我从市场买了十八个苹果。