Dunbar says his number of 150 "refers to those people with whom you have a personalized relationship, one that is reciprocal and based around general obligations of trust and reciprocity."
Dunbar说他定出的这150人“指的是那些和你直接建立关系的人，彼此信任，互惠互助。
2
It is the aim of science to establish general rules which determine the reciprocal connection of objects and events in time and space.
科学目的是确立的一般规则，确定相互连接的物体和事件时间和空间。
3
In this paper, according to the risk neutral pricing theory, the reciprocal stochastic differential equations and the general pricing formulas of the four types of cross-cur.