A civilized society or country has a well developed system of government, culture, and way of life and that treats the people who live there fairly.

A fair justice system is a fundamental part of a civilized society. 公正的司法制度是文明社会非常重要的一部分。

The terrorist attack on the UN building has shocked the civilized world. 恐怖分子对联合国大楼的袭击震惊了文明世界。

If a person or their behaviour is civilized, they are polite and behave in a calm and reasonable way.

Let's discuss this like civilized people (= politely and calmly). 让我们像文明人一样心平气和地讨论这件事吧。

used to describe a pleasant or comfortable place or thing

"This is all very civilized," he said, settling himself down in a chair by the fire. “这一切都这么舒适，”他说着坐在炉火边的椅子上。