Most of these are probably self-explanatory, like addition, subtraction, multiplication and division.
其中大多数可能都是不言自明的，比如加法、减法、乘法和除法。
2
By and large, nomadism implies a high degree of self-sufficiency and inhibits the appearance of an extensive division of labor.
总的来说，游牧意味着高度的自给自足，并抑制了广泛劳动分工的出现。
3
This division of the self into “the real you and the role you, ” says Zimbardo, is also common among “shy extroverts” - people who appear outgoing in public yet are shy in private.