New words：

theory [ˈθiəri] n. 理论；原理；学说；原则

Sample Sentences：

We need to connect theory with real life.
We will study the theory first, then do experiments.
She read a book about Darwin's theory of evolution.

evolution [ˌiːvəˈluːʃn] n. 演变；进化；发展；渐进
evolve [ɪˈvɒlv] v. 进化；演化；逐步发展

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