Conceptually, people have thought about life, what it is, what makes it different from things that are not alive, since people have had thoughts.
개념 측면에서, 사람들은  생명에 대해 생각해왔습니다. 생명이란 무엇이며,  죽어있는 것과 어떻게 다른지 사람들은 늘 생각해왔죠.