I think that you don't really have self possession if you choose to live in a society because you cannot just discount the people around you.

我认为，如果你选择生活在社会中，就不可能完全拥有自我，因为你不能无视周围的人的存在。

youdao

He soon recovered his usual self-possession.

他很快恢复了平时沉着冷静的样子。

《牛津词典》

She found her customary self-possession had deserted her.

她发现自己不像平时那样遇事不惊了。

《柯林斯英汉双解大词典》

In 2008,the Supreme Court ruled that the Second Amendment protects the right to keep and bear arms for the purpose of self-defense, striking down a Washington,D.C.law that banned the possession of handguns in the home.

VOA: standard.2010.06.29

I mean, technically, if I want to personally go out and kill someone because they offend me, that is self possession.

我是说，理论上讲，如果因为别人冒犯我,我就要亲自动手杀了他，这也算自主权。

耶鲁公开课 - 公正课程节选

What are the consequences for a theory of justice and in account of rights of calling into question the idea of self possession?

如果有一套公正理论和对权利的解释,对自我拥有提出质疑，会引起怎样的后果呢？

耶鲁公开课 - 公正课程节选

His self-confidence and self-possession come in part from the fact that he enjoys a life outside the world of sailing.

FORBES: Magazine Article

As a hero, Mr. Fox has the arch self-possession to insist to his wife that he poaches poultry ''because I'm a wild animal.

CNN: Review: 'Mr. Fox' is fantastic

How does this fit among disorders that allow for greater self-possession?

NEWYORKER: Little Strangers