round robin

round-robin的词性：
n.（名词）

1. Sports A tournament in which each contestant is matched in turn against every other contestant.
【体育运动】 循环赛：每个比赛者依次和所有对手都进行比赛的锦标赛

2. A petition or protest on which the signatures are arranged in a circle in order to conceal the order of signing.
圆形签名请愿书或抗议书：签名时排列成圆形使分不清签名者先后的请愿书

3. A letter sent among members of a group, often with comments added by each person in turn.
传阅的信件：阅后签名并常加注意见的传阅信件