translation.en: And that is, there is a sudden emergence and rapid spread of a number of skills that are unique to human beings like tool use, the use of fire, the use of shelters, and, of course, language, and the ability to read somebody else's mind and interpret that person's behavior.
translation.zh: 那就是，各种独特的“人类”技巧 突然出现以及迅速传播。这些技巧包括 工具的使用、 火的使用、房屋的出现和语言交流， 以及读取他人心思的能力和 理解他人的行为。