You use civil to describe events that happen within a country and that involve the different groups of people in it.
civil unrest.
民众的骚乱。
You use civil to describe people or things in a country that are not connected with its armed forces.
the US civil aviation industry.
美国民用航空工业。
You use civil to describe things that are connected with the state rather than with a religion.
They were married on August 9 in a civil ceremony in Venice.
他们于8月9日在威尼斯举行了世俗婚礼。
You use civil to describe the rights that people have within a society.
a United Nations covenant on civil and political rights.
一份关于民权和政治权利的联合国公约。
Someone who is civil is polite in a formal way, but not particularly friendly.
As visitors, the least we can do is be civil to the people in their own land.
作为游客,我们至少要能做到文明地对待当地人民。