by·stand·er /ˈbaɪˌstændɚ/
看熱鬧的人;旁觀者
By·stand·er n. One who stands near; a spectator; one who has no concern with the business transacting.
He addressed the bystanders and scattered pamphlets among them. --Palfrey.
Syn: -- Looker on; spectator; beholder; observer.
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bystander
n : a nonparticipant spectator