复数： eighteens

Eighteen wheelers were starting to fly by in both directions .

十八轮的大卡车开始朝两个方向飞驰而过。

Has been raised from eighteen to twenty-one .

由原来的十八岁提高到二十一岁。

Common sense is the collection of prejudices acquired by age eighteen .

常识就是十八岁时就形成的偏见的总和。

Eighteen indian cities and several middle eastern ones are designing urban rail networks .

印度的十八座城市和几个中东城市已经在设计城市轨道网。

They also have eighteen grandchildren and one great-grandchild .

他们一共有十八个孙子孙女和一个曾孙子。