B2 formal to watch carefully the way something happens or the way someone does something, especially in order to learn more about it观察;观测;监视
More examples
In Istanbul, East and West fuse together in a way that is fascinating to observe.
The satellite will observe objects that are particularly interesting astronomically.
Some scientists believe that there is about ten times as much matter in the universe as astronomers have observed.
The research project has been observing changes in the local population.
Security guards are able to observe the car park using CCTV.
C1 formal to notice or see注意到,觉察到;看到
More examples
Did you observe the make of the vehicle?
The inspectors observed some irregularities in his tax return.
Did you observe anything unusual about his appearance?
Scientists have been observing variations in the thickness of the ozone layer.
She observed a parking space next to the entrance to the building.
formal to make a remark about something说,讲;评论,评述
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