每两个空格间或两个逗号间的三位数都被看作“十位数或百位数的千”或“十位数或百位数的百万”。例如56 000 fifty-six thousand和600,000,000 six hundred million。dozen,score,hundred,thousand,million等数词前面有基数词或某些表示数量的形容词时,不加-s。
例如 a few hundred meters 几百米 several million people 数百万人 two thousand teachers 两千位老师,但如表示“几百”“几千”“几百万”等笼统的数目时,则应用-s of构成短语。如:hundreds of books 几百本书 thousands of workers 几千个工人
twenty[英] [ˈtwenti][美] [ˈtwɛnti, ˈtwʌn-]n.二十,二十个; 二十多岁; 二十年代; 许多,大量;num.二十;[例句]They're both in their twenties and both married with children of their own.他们俩都二十几岁,都已经结婚生子了。[复数]twenties