a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
a belief that can guide behavior
theory.的用法和样例:
例句
The whole theory rests on a wrong assumption. 整个理论都是建立在错误的假定上。
Einstein's theory marked a new epoch in history. 爱因斯坦的理论标志著历史上一个新时代的开始。