九千的英文：
nine thousand

It is nine now.
现在九点了。

A stitch in time save nine.
一针及时省九针。

Nine plus one is a decade.
9加1是10。

Nine is the square of three.
九是三的平方。

I have nine little goldfish.
我有九条小金鱼。

Tens of thousands
成千上万

The town has a population of ten thousand.
这个镇有一万人口。

A thousand people attended the conference.
一千人参加了会议。

Not a single miss in a thousand times
万无一失

Thousands of people jammed the stadium.
成千上万的人把体育场挤得满满的。