世纪

例句

• zhè这shì是 2 1shì世jì纪 。

  This is the 21st century.

• èr二shí十shì世jì纪yǐ以lái来 ，rén人lèi类kē科jì技fā发zhǎn展dé得fēi非cháng常kuài快 。

  Since the twentieth century, human science and technology have developed very quickly.

用法