principle ·noun (IDEA)
Definition: a basic idea or rule that explains or controls how something happens or works Level: C1
我们的科学老师创建了实践实验室，学生可以在其中发现科学原理。
Our science teachers created hands-on laboratories in which students can discover scientific ___principles.
该组织运作的原则是所有成员拥有相同的权利。
The organization works on the ___principle that all members have the same rights.
遵循这两条原则，我相信你会变得健康。
Follow these two ___principles, and I'm sure you will become fit and healthy.