In the 1920s, American sociologist Emory Bogardus developed the social distance scale, which measures how closely people are willing to interact with people from different races and ethnicities.
1920 年代， 美国社会学家 Emory Bogardus 开发了社交距离量表，衡量人们愿意与来自不同种族和族裔的人互动的密切程度。