1. We should situate a thinker and his thought in their proper place.
    我们应当给一位思想家及其思想以合适的地位。

2. He is a great thinker.
    他是个伟大的思想家。

3. About 2,300 years ago, there lived in Greece a great thinker named Aristotle.
    大约两千三百年以前, 在希腊住着一位名叫亚里斯多德的伟大的思想家.