B2 a formal statement of the rules on which a subject of study is based or of ideas that are suggested to explain a fact or event or, more generally, an opinion or explanation理论;学说;意见
B2 If something is possible in theory, it should be possible, but often it does not happen in that way.理论上,从理论上讲
More examples
It was Ptolemy who propounded the theory that the earth was at the centre of the universe.
This new evidence lends support to the theory that she was murdered.
This research seems to give some validity to the theory that the drug might cause cancer.
In Jungian theory, there are certain archetypes of human personality.
In theory, women can still have children at the age of 50.
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