theory的音标是 ˈθɪəri，意思是理论、学说或看法。在英文中，theory通常指基于观察和推理的系统化解释，也可表示个人观点或推测。其复数形式为theories。

theory的翻译为"理论"或"学说"，例如在科学语境中指科学理论，在日常生活中可表示个人看法。

以下是10个带中文翻译的例句：
1 His theory has been widely accepted by scientists 他的理论已被科学家广泛接受
2 She has a theory about why the project failed 她对项目失败的原因有自己的看法
3 The theory of evolution was proposed by Charles Darwin 进化论由查尔斯·达尔文提出
4 In theory this method should work but in practice it may not 理论上这种方法应该有效但实际上可能不行
5 They are testing a new economic theory 他们正在测试一种新的经济理论
6 Her theory proved to be correct after experiments 实验证明她的理论是正确的
7 There are many theories about the origin of the universe 关于宇宙起源有许多理论
8 The detective has a theory about who committed the crime 侦探对谁犯了罪有一个推测
9 According to this theory light behaves as both a particle and a wave 根据这个理论光既表现为粒子也表现为波
10 His theory lacks solid evidence 他的理论缺乏坚实证据

常见短语搭配：
scientific theory 科学理论
conspiracy theory 阴谋论
game theory 博弈论
theory of relativity 相对论
in theory 理论上
develop a theory 发展理论
prove a theory 证明理论
challenge a theory 挑战理论
economic theory 经济理论
learning theory 学习理论