threesome
n. 三倍的; 三人一組; 三人的競賽; 一人對兩人的比賽
A threesome is a group of three people.
1. the cardinal number that is the sum of one and one and one
2. three people considered as a unit
By then the threesome was already past its prime.
到聚會時三人都已經超過了做研究的最佳時期.