1. turn of the century
   n.19世纪未20世纪初,19世纪与20世纪转换交替时期
   

1. Selections from 20th-Century American Short Stories.
   【二十世纪美国短篇故事选集】。
2. His revolutionary activities spanned half a century.
   他的革命活动长达半个世纪。
3. The space age dawned in the twentieth century.
   宇宙时代开始于20世纪。
4. The country was a great naval power in past centuries.
   该国在前几个世纪是海上强国.
5. Chaucer flourished at the end of the 14th century.
   乔叟在14世纪末最享盛名。

　2个名词解释