looker-on

剑桥词典

someone who watches something that is happening in a public place but is not involved in it
旁观者
At every gathering for dances , sports , or games of any kind there are more lookers-on than participants . 每次舞蹈、体育或其他比赛的活动中，旁观者都比参与者多。
同义词
onlooker 返回 looker-on