这位进化论学者在讲座中解释了物种如何随时间改变。

The ___evolutionist explained how species change over time during the lecture.

作为一名进化论者，他更倾向于通过逐步改革而非激进革命来推动社会进步。

As an ___evolutionist, he preferred gradual reforms over radical revolutions to advance society.