1、近代：modern。

例句：China has become a modern country for the past thirty years.

翻译：过去三十年中，中国已经变成了一个现代化的国家。

2、当代：contemporary。

例句：Einstein was a contemporary outstanding talents.

翻译：爱因斯坦是一位当代杰出人才。

3、现代：modern。

例句：Many people pretend that they understand modern art.

翻译：很多人都自称懂得现代艺术。