reciprocity

n.

相互性；相互作用；互给；互惠

reciprocity and mutual benefit互惠互利

reciprocity theorem[物]互易定理；[电磁]倒易理论

1. Courtesy requires reciprocity among neighbors.
   乡里之间讲究礼尚往来。
2. Reciprocity is an ultimate truth of the universe.
   相互作用是宇宙的真正的终极原因。
3. Reciprocity needs more communications from both countries.
   互惠互利建立在两国加强沟通的基础上。
4. It is a mutual relationship, a true reciprocity we are now engaged in building.
   我们正在建立的是一种相互的，真正互惠的关系。

A theory of reciprocity ☆
Evolution of indirect reciprocity.
A Theory of Sequential Reciprocity
A theory of sequential reciprocity.
The Norm of Reciprocity: A Preliminary Statement
Trust, reciprocity, and social history: A re-examination
Evolution of indirect reciprocity by image scoring
ERC: A Theory of Equity, Reciprocity, and Competition
Fairness and Retaliation: The Economics of Reciprocity
Social exchange in organizations: Perceived organizational support, leader–member exchange, and employee reciprocity.