round robin
剑桥词典
round robin noun [C] (LETTER)
UKa letter , usually of demands or complaints , that is signed by many people
（通常指提出请求或投诉的）联名信，联名声明书
UK
a letter that you send to a lot of people , for example at Christmas , telling them what you have done that year
传阅的信件，发送给多人看的信件（如在圣诞节时的信件，告诉别人自己那一年所做的事情）
round robin noun [C] (COMPETITION)
a competition in which all the players play against each other at least once
循环赛 返回 round robin