passer-byThese 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
-
A passer-by told the driver to move his car so that it was not causing an obstruction
一个过路人叫那个司机把他的车挪一挪，免得挡道。
-
He started to run away and barged against a passer-by .
他拔腿跑开，和一个过路人撞个满怀。
-
Police asked passers-by if they had seen the accident .
警察询问过路的人是否目击了这次事故。
-
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。
-
Passers-by simply looked on as he was attacked .
他遭人袭击，路人只在一边袖手旁观。
-
Innocent passers-by got caught up in the riots .
无辜的过路人被卷入了那场暴乱。
-
Passers-by grappled with the man after the attack .
袭击之后过路人便与这男人扭打起来。
-
He wandered the streets raving at passers-by .
他在街上闲逛，跟过路的人瞎扯。
-
I went and sat in a cafe and watched the passers-by .
我走进一家咖啡馆坐下，望着来往的路人。
-
Passers-by heard his cries for help .
路过的人听到了他求救的呼喊。
-
Minicabs are prohibited by law from touting passers-by for business .
无标志的预约型出租车沿街拉客是非法的。
-
Police have planned a reconstruction of the crime tomorrow in the hope this will jog the memory of passers-by .
警方已计划明天再现犯罪现场，希望当时路过的人能想起些什么。
-
I spent a fruitless ten minutes walking up and down the high street , desperately avoiding eye contact with passers-by .
我在大街上一无所获来回走了10分钟，其间还要拼命地躲避路人的目光。
-
Marchers jeered at white passers-by , but there was no violence , nor any arrests
游行者奚落路过的白人，但没有发生暴力事件，也没有人被逮捕。
-
He asked a passer-by the way to the post office .
他问路人去邮局的路。
-
Her beauty attracted many passers-by .
她的美貌吸引了很多路人。
-
They are merely passers-by on the stage of history .
他们不过是历史舞台上昙花一现的人物。
-
His bad behaviour earned him indignant glare from passers-by .
他的卑劣行为令路人为之侧目。
-
More sentries were posted to interrogate and examine the passers-by .
加设岗哨，盘查行人。
-
The passer-by then asked : " His father can swim , but does it follow that the son can also swim without practice ? "
那个过路人就说：“爸爸会游泳，难道他儿子不经过练习，也会游泳吗？”
-
The passer-by asked : " Why are you to throw the child into the river ? Aren 't you afraid he would be drowned ? "
那个过路人就问：“你为什么要把孩子投到江里去？难道不怕他淹死吗？”
-
There are more and more passers-by . Some of them look up into the sky , like me – those are romantic types and I bless them ;
来来往往的人开始多了，有人像我一样看，那是比较浪漫的，我祝福他们；
-
Next to me was a woman demonstrating a shower saver . As she was telling a passer-by the qualities of the device , she mentioned that it saved 25000 gallons of water a year .
我隔壁摊位的女士说卖沐浴节水器的，当她向一位过路人推销淋浴电器时，她提到了这个节水器每年可省下2.5万加仑的水。
-
To help a blind passer-by or elderly cross the road .
带领一位弱视途人或长者横过马路。
-
Quality evaluation of passers-by height wind enviroment around buildings
建筑物周围行人高度风环境的质量评估
-
The tourist stopped a passers-by and asked him the way .
旅行者拦住了一个过路人，向他问路。
-
Passers-by , look around , home buyers select a store to others .
路人，环顾四周，购房者选择一店给他人。
-
Police asked passers-by if they had seen the accident happen .
警察询问过路的人是否见到事故发生的经过。
-
" Did I see you on TV last night ?" asked the passer-by .
“昨晚我在电视上看到你了吗？”路人问道。
-
Passers-by would slip the beggar some change when they passed .
过路人从那乞丐身边走过时，总会塞给他一点零钱。