bystander
noun [ C ] uk/ˈbaɪˌstæn.dər/ us/ˈbaɪˌstæn.dɚ/
旁观者
a person who is standing near and watching something that is happening but is not taking part in it
Many innocent bystanders were injured by the explosion. 许多无辜的旁观者在爆炸中受伤。
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