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.