theory

中文意思

• n. 理论
• n. 学说
• n. 原理
• n. 推测

英文释义

• n. 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
• n. a belief that can guide behavior

词形变化

复数

theories

例句

1. n. 理论

   It is easy to explain the plan in theory, but putting it into practice is much harder.

   从理论上来解释这个计划很容易，但付诸实践要难得多。

2. n. 学说

   Charles Darwin proposed the theory of evolution in the nineteenth century.

   查尔斯·达尔文在十九世纪提出了进化学说。

3. n. 原理

   Students in this class learn the basic theory of how engines work.

   这个班的学生会学习发动机运转的基本原理。

4. n. 推测

   I have a theory that he missed the train, but I need to call him to be sure.

   我推测他是没赶上火车，不过我得给他打个电话确认一下。