a reasonable or scientifically acceptable explanation for a fact or event
general principles and knowledge as opposed to practical methods or skills
opinion or supposition, not necessarily based on reasoning
"theories can incorporate facts and laws and tested hypotheses"
"true in fact and theory"
"a scientific hypothesis that survives experimental testing becomes a scientific theory"
"he proposed a fresh theory of alkalis that later was accepted in chemical practices"
"the architect has a theory that more is less"
"they killed him on the theory that dead men tell no tales"
My aunts and uncle had..no theories about child upbringing.
出自： Day Lewis