theory
柯林斯词典
1. N-VAR A theory is a formal idea or set of ideas that is intended to explain something. 理論
Marx produced a new theory about historical change based upon conflict between competing groups. 馬尅思提出了一個新理論，認爲歷史變革是由於對立集團的沖突而産生的。
2. N-COUNT If you have a theory about something, you have your own opinion about it which you cannot prove but which you think is true. 觀點
There was a theory that he wanted to marry her. 有種觀點認爲他想娶她。
3. N-UNCOUNT The theory of a practical subject or skill is the set of rules and principles that form the basis of it. 基礎理論
He taught us music theory. 他教我們樂理。
4. PHRASE You use in theory to say that although something is supposed to be true or to happen in the way stated, it may not in fact be true or happen in that way. 從理論上說
Achieving these goals is relatively easy in theory, yet quite difficult in practice. 實現這些目標從理論上說比較容易，但在實踐上卻相儅睏難。
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theory /ˈθɪərɪ/ (theories)
剑桥词典
- 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
- 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. 返回 theory
理論；學說；意見
economic theory 經濟理論
scientific theory 科學理論
Darwin's theory of evolution 達爾文的進化論
He has a theory that the hole was caused by a meteorite . 他認爲那個洞是隕石墜落形成的。
in theory
If something is possible in theory, it should be possible , but often it does not happen in that way.
理論上，從理論上講
In theory, the journey should take three hours , but in practice it usually takes four because of roadworks . 按理說行程應該衹要3小時，但由於道路施工，實際上通常會需要4小時。
例句