联合国观察员的英文：
U.N. observer

We observed the barometer fall. [The barometer was observed to fall.]
我们看见晴雨表下降。

Observation is the best teacher.
观察是最好的老师。

They observed the behavior of their new pet.
他们观察他们新宠物的生活习性。

The professor is an acute observer.
那教授是位敏锐的观察家。

This suspect comes under observation.
这个可疑分子受到监视。