translation.en: Now, this distinction is natural enough and often moral enough, but it can go awry, and this was part of the research of the great social psychologist Henri Tajfel.
translation.zh: 这些区别是自然而然的 时常也是道德的， 但有时也会出错， 这是伟大的社会心理学家 亨利·泰吉弗尔研究的一个部分。