num.十八;十八个;
n.十八个的;十八的;
例句:
My daughter is eighteen years old and has grown into a beautiful lady.
我的女儿十八岁了,已经长成为美丽的淑女.
When I was eighteen, I decided that it was time I cleared out.
18岁时, 我决定是我离开家的时候了.
He was eighteen years old when he joined the army.
他18岁参军.