数词十八; 十八个
名词十八岁; 十八的记号; 十九世纪; 是八点钟
形容词
1. eighteen
1. There are eighteen students in that classroom. 那教室里有十八个学生。
名词
1. She is eighteen now. 她现在十八岁了。
2. Two times nine makes eighteen. 二乘九等于十八。