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
n. 理论, 学说, 原理, 意见, 推测
[化] 理论
1. The theory of evolution explains how species change over time.
进化理论解释了物种如何随着时间而改变。
2. Many scientists support the theory that climate change is caused by human activity.
许多科学家支持气候变化是由人类活动引起的理论。
3. In mathematics, a theory can help us understand complex problems better.
在数学中，理论可以帮助我们更好地理解复杂问题。