bystanderThese are all words for a person who sees sth happen.以上各词均指目睹事情发生的人。
a person who sees sth happen and is able to describe it to other people; a person who gives evidence in a court of law指目击者、见证人、证人：
Police have appealed for witnesses to the accident.
警方呼吁这起事故的目击者出来作证。
a group of people who have gathered to watch or listen to sth such as a play or concert; the number of people who watch or listen to the same thing on television, the radio or in the cinema指戏剧、音乐会、电视、电台、电影等的观众或听众
a person watching television; a person who looks at sth指电视观众、观看者：
The programme attracted millions of viewers.
这个节目吸引了数百万电视观众。
Some of her art is intended to shock the viewer.
她的一些艺术作品旨在教观赏者吃惊。
a person who sees sth happen指观察者、目击者：
According to observers, the plane exploded shortly after take-off.
据目击者说，飞机起飞后不久就爆炸了。
a person who is watching an event, especially a sports event指观看者、观众，尤指体育比赛的：
The stadium holds 75 000 spectators.
该体育场可容纳7.5万名观众。
a person who watches sth that is happening but is not involved in it指旁观者：
A crowd of onlookers gathered at the scene of the crash.
在撞车地点聚集了一大群围观者。
a person who is going past sb/sth by chance, especially when sth unexpected happens路人、过路的人，尤指意想不到的事发生时碰巧路过的：
Police asked passers-by if they had witnessed the accident.
警察询问过路的人是否目击了这次事故。
a person who is near and can see what is happening when sth such as an accident or fight takes place指现场目击者、旁观者：
Three innocent bystanders were killed in the crossfire.
三个无辜的旁观者在交叉火力中丧生。
a person who has seen a crime or accident and can describe it afterwards指犯罪或事故现场的目击者、见证人
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It looks like an innocent bystander was killed instead of you .
看起来是一个无辜的旁观者当了你的替死鬼。
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A bystander named John Roulstone wrote a poem about the event , then , at some point , Hale herself seems to have helped write it .
一个名叫约翰·罗尔斯登的旁观者就此事写了首诗，然后在某个时间，赫尔自己似乎也帮助完成该作品的创作。
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Three innocent bystanders were killed in the crossfire .
三个无辜的旁观者在交叉火力中丧生。
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Bystanders claim they were manhandled by security guards .
旁观者声称他们遭到了保安人员的粗暴推搡。
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Both groups on either side are just picking off innocent bystanders
对峙双方都只是在瞄准射击无辜的旁观者。
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Brand elbowed his way to the centre of the group of bystanders .
布兰德挤到看热闹的人群中央。
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McMullen performed CPR while other bystanders called 911 .
麦克马伦进行人工呼吸，其他旁观者则打了911。
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Whatever you do , don 't be a bystander ．
不管你做什么，都别当旁观者。
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Police attach credence to the report of an unnamed bystander .
警方认为一位不知姓名的目击者的报告很有用。
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It 's worth noting that if the umbrella is designed to shoot rain away from your head through an air pump , it would almost certainly shoot that rain onto surrounding innocent bystanders .
需要注意的是，空气伞的设计原理是通过空气泵将你头顶的雨驱散开，而这一行为肯定会将雨水打落到周遭的无知群众身上。
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But he only looked at it without drinking . A bystander asked , " You are suffering from thirst . How that you have found water , why don 't you drink it ? "
旁边的人对他说：“你如此干渴，追逐寻找水，现在到了河边，为何不痛饮？”
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In vivo studies of bystander effect in gene therapy to glioma
神经胶质瘤基因治疗中旁观者效应的动物试验
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A study on the radiation-induced bystander effect of immune cells
电离辐射诱导免疫细胞旁效应的实验研究
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I used to be a bystander in own world watching others play .
我习惯做一个旁观者在自己旳世界看别人的戏。
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But they elected to take part in the system and to play bystanders .
但他们会选择加入体系之中扮演旁观者的角色。
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Study on bystander effects induced by radiation
辐射诱发的旁效应研究
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The system had considerable bystander effect .
该体系旁观者效应明显。
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Observation of bystander effect by MTT method ;
MTT法检测旁观者效应；
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The application of microbeam in the research on radiation-induced bystander effects
微束在辐射诱导的旁效应研究中的应用
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The study of Bystander Effect in RV-HSV-tk-GCV system gene therapy for glioma
RV-HSV-tK-GCV系统基因治疗中的旁观者效应研究
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Enhancing Effect of Chinese Herbal Medicine Active Components on Suicide Gene Bystander Effect and the Mechanism Study
中药活性成分对自杀基因旁观者效应增效作用及机制研究
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Relationship between p53 and Bystander Effect Induced by the Radiated Hepatocellular Carcinoma Cells
受辐射肝癌细胞所诱导的旁效应与p53基因的关系
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There was high bystander effect .
此杀伤作用存在旁观者效应，且较强。
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Bystander effects on mammalian cells induced by carbon ions
碳离子辐照哺乳动物细胞引起的旁观者效应
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Progress of radiation - induced bystander effect
辐射诱导旁效应研究进展
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I don 't think they realize I was just a bystander .
我想他们没有意识到我只是一个旁观者而已。
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The influence of connexin 43 to bystander effect of double suicide genes systems
缝隙连接蛋白43对双自杀基因系统旁观者效应的影响
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Preliminary study on bystander effects and the mechanisms mediated through irradiated conditioned medium
培基介导的辐射旁效应及机理初探
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An Investigation on Nursing Students ' Attitudes Toward the Performance of Bystander CPR
高职护生对不同人群实施现场心肺复苏态度的调查分析
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The rest of the world was just a bystander .
世界上其余的国家只是一个旁观者。