observer

名词 observer:

1. a person who becomes aware (of things or events) through the senses
   同义词：perceiver, percipient, beholder
2. an expert who observes and comments on something
   同义词：commentator

1. He is an acute observer.
   他是个敏锐的观察家。
2. Having the back showing or in view of the observer.
   背面的显露出背面的或背对观察者的
3. A person stationed in a given location as a spy or an observer.
   间谍作为间谍或观察者处在给定位置的人
4. The driver is a poor observer of speed restrictions.
   这个司机是个不遵守速度限制的人。
5. They sent her there as an observer.
   他们派她去那做观察员。

ob.serv.er

n.（名词）
One that observes:
遵守者，观察者：遵守的人：
例句：
an observer of local customs; observers of religious holidays.
当地习俗的遵守者；宗教节日的观察者

A delegate sent to observe and report on the proceedings of an assembly or a meeting but not vote or otherwise participate.
观察团：一个代表团，派去观察并报告集会或会议进展，但不投票或参与其它活动

A crew member on a military aircraft who makes observations.
观察员：军用飞机上进行观察或侦察的机员
A member of an armed force who watches and reports from an observation post.
观察员：军队中一员，从观察站观察并报告情况