Although the term "psychopath" is popularly applied to an especially brutal criminal, in psychology it is someone who is apparently incapable of feeling compassion or the pangs of conscience.
it is someone who is
it is a person
they are people who are
it refers to someone who is
it is in reference to people
the term is someone错
系动词是主语表语平行的标志。表语不能是概念
为什么不是最后一个呢