principle of removal of constraint

例句：

1. 1. The teacher explained the conceptof gravity to us in a simple andclear way.
   老师用简单明了的方式向我们解释了重力的概念。
2. 2. The company's policyon environmental protection is a fundamental principle thatguides its operations.
   公司对环境保护的政策是其运营的基本原则。
3. 3. The new law hasbeen introduced as a fundamental principle to protectthe environment.
   新法律被引入作为保护环境的基本原则。