| 释义 |
the.oryH5WIE7ri, $5WIr7ina formal statement of the rules on which a subject of study is based or of ideas which are suggested to explain a fact or event or, more generally, an opinion or explanation理论; 学说; 意见economic theory [U]经济理论scientific theory [U]科学理论music theory [U]音乐理论Einstein's theory of relativity [C]爱因斯坦相对论Darwin's theory of evolution [C]达尔文进化论His theory is that the hole was caused by a meteorite. [C + that clause]他认为那洞是由陨星造成的。In theory (= According to the facts), the journey ought to take three hours, but in practice (= when it happens) it usually takes four because of roadworks.按理说旅行只需要三小时，但由于道路施工实际上用了四小时。
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