名詞 theory:

1. 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
2. a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
   同義詞：hypothesis, possibility
3. a belief that can guide behavior

1. Not everyone can understand Einstein's Theory of Relativity.
   不是每個人都能讀懂愛因斯坦的相對論的。
2. In this way they can better apply theory to practice.
   這樣他們就能更好地把理論運用到實踐中去。
3. Only in 1687 did he at last publish his new theory.
   終于在一六八七年他發(fā)表了他的新理論。
4. Mary is full of fascinating theories about men and women.
   瑪麗對男人和女人充滿了迷人的想法。
5. Do you agree to the wave theory of light?
   你同意光的波動理論嗎？
6. It is so in theory.
   理論上是如此。