91990的英文怎么写

　　thousand的例句：

　　The system produced enough energy to heat several thousand homes.

　　系统产生的能量足以给几千户人家供暖。

　　A thousand people were there.

　　那里有一千人。

　　Fifty thousand people saw the match.

　　有五万人观看了那场比赛。

　　The car cost a cool thirty thousand.

　　那辆车花了整整三万。

　　Two thousand—and that's my bottom line!

　　两千块—不能再低了！