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IELTS BNC: 596 COCA: 918

theory

theory /ˈθiːjəri/ noun
plural theories
theory
/ˈθiːjəri/
noun
plural theories
Learner's definition of THEORY
: an idea or set of ideas that is intended to explain facts or events学说;…论;…说
[count]
[noncount]
[count] : an idea that is suggested or presented as possibly true but that is not known or proven to be true看法;设想;猜测
[noncount] : the general principles or ideas that relate to a particular subject理论;原理;原则

in theory

used to say what should happen or be true if a theory is correct从理论上讲;按理说
used to say that something seems to be true or possible as an idea but may not actually be true or possible在理论上(是正确的或有可能的)

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