trialist
/ˈtraɪəlɪst/( <英> 亦作triallist)
noun
1- a person who participates in a trial, in particular参试者, 尤指：
1.1
- a person who takes part in a sports trial or motorcycle trial体育预赛参加者; 摩托车障碍检验赛参加者。
1.2
- a person who takes part in a clinical or market test of a new product临床试验者; 新产品试用者。