translation.en: For example, anything that spreads by a form of social contagion could be understood in this way, from abstract ideas on the left like patriotism, or altruism, or religion to practices like dieting behavior, or book purchasing, or drinking, or bicycle-helmet [and] other safety practices, or products that people might buy, purchases of electronic goods, anything in which there's kind of an interpersonal spread.
translation.zh: 比如说，任何以社交形式传播的事情， 都能用这种方法来理解， 从左边这些抽象的事物， 像爱国主义，或利他主义，或者宗教， 到具体的事物， 像饮食行为，或者买书， 或饮酒，或自行车头盔和其他的一些安全措施， 或者人们可能买的产品， 电子书的购买， 任何能在人们之间传播的事情。