第20的英文怎么写

World War I left an indelible imprint on the twentieth-century world.

第一次世界大战给20世纪的世界留下了深远的影响。

Some have called him the greatest entertainer of the twentieth century.

有人称他为20世纪最伟大的.表演艺术家。

This was how I stepped into my twentieth year.

我就是这样地跨进我的二十岁。