激进者和保守者

其实
激进者 就是 radical

radical
n.[C]
1. 根部;基础;基本原理
2. (常大写)激进分子;激进党派成员
He was a political radical.
他曾是政治上的激进分子。

rsomeone who has new and different ideas, especially someone who wants complete social and political change

e.g. radicals on the extreme left wing of the party
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保守者 就是 conservative
conservative
n.[C]
1. 保守者,守旧者
The conservatives are opposed to any change.
保守分子反对变革。
someone who does not like changes in politics, ideas, or fashion

e.g.An argument between reformers and conservatives in the organization