1
a bystander to sth
指虽然在场但未参与其中的人，to 后接事件或情形。
She was an innocent bystander to the whole dispute.
她完全是这场纠纷的局外旁观者。
旁观者
bystanders — plural of bystander
先理解核心含义，再看它在真实句子里的用法。
旁观者
a nonparticipant spectator
She was an innocent bystander to the whole dispute.
她完全是这场纠纷的局外旁观者。
虽在场但不参与的人；旁观者、目击者或观看者。
A person who, although present at some event, does not take part in it; an observer, witness, or spectator.
A bystander called an ambulance after noticing the injured cyclist.
一名旁观者注意到受伤的骑车人后叫了救护车。
Several bystanders watched the argument but no one tried to stop it.
几个旁观者观看了争吵，但没有人试图阻止。
The police interviewed a bystander who had seen the thief run away.
警方询问了一名目击小偷逃跑的旁观者。
指虽然在场但未参与其中的人，to 后接事件或情形。
She was an innocent bystander to the whole dispute.
她完全是这场纠纷的局外旁观者。
指旁观者主动介入以帮助受害者的行为，常用作名词短语。
The course teaches bystander intervention.
这门课程教授旁观者干预。
表示以旁观者的身份或角色，常与 watch、stand 等动词连用。
He could only watch as a bystander.
他只能作为旁观者看着。
Not this
I bystandered the accident and just watched.
Use this
I was a bystander at the accident and just watched.
bystander 是名词，不是动词。汉语的“旁观”是动词，但英语中要表达“作为旁观者”须用 be a bystander 加介词 at 或 to。
Not this
He was an innocent bystander of the fight.
Use this
He was an innocent bystander to the fight.
表示“某个事件的旁观者”时，bystander 后接介词 to 或 at，通常不用 of。这是受汉语“的”译成 of 的干扰。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
无辜的旁观者
He was an innocent bystander when the fight broke out.
打架发生时，他是个无辜的旁观者。
旁观者效应
The bystander effect explains why people often don't help in an emergency.
旁观者效应解释了为什么人们在紧急情况下常常不提供帮助。
旁观者干预
The training program focuses on bystander intervention in cases of harassment.
该培训项目着重于骚扰情况下的旁观者干预。
仅仅是个旁观者
She was not a mere bystander; she helped the injured cyclist.
她不仅仅是旁观者；她帮助了受伤的骑车人。
消极的旁观者
Don't be a passive bystander if you see bullying.
如果你看到欺凌行为，不要做消极的旁观者。
无辜的旁观者；无辜受牵连的人
Several innocent bystanders were injured in the bomb blast.
爆炸中有几名无辜的旁观者受伤。
对……袖手旁观
He was not willing to be a bystander to the bullying.
他不愿意对霸凌行为袖手旁观。
不只是旁观者
We should be more than a bystander and offer help.
我们应该不只是旁观者，而要提供帮助。
Use bystanders naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
站在旁边(by)站着(stand)的人，就是旁观者：联想“站在一旁看热闹，不参与”。
语域：neutral 常见场景：事故现场、新闻事件描述 该词通常用于指在场但未参与事件的人，多用于事故、新闻或冲突情景，语气比较常见于中性表达。
这些词的词尾 -ander 均读作 /ændər/，与 bystander 的重音部分 /stændər/ 押韵。注意 wander（/ˈwɒndər/）、gender（/ˈdʒendər/）、tender（/ˈtendər/）拼写相似但元音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.