孔子被认为是历史上最伟大的政治思想家之一。

Confucius is considered one of history's greatest political ___thinkers.

以赛亚·伯林被认为是二十世纪一位重要的政治思想家。

Isaiah Berlin is regarded as a major political ___thinker of the twentieth century.

这次会议汇集了来自全球顶尖的科学思想家。

The conference brought together leading scientific ___thinkers from around the globe.