principles of chemistry

例句：

1. 1. The teacher explained the principles of physics to us.
   老师向我们解释了物理学的基本原理。
2. 2. The principles of physics are crucial for understanding the universe.
   物理学的原理对于理解宇宙至关重要。
3. 3.The principles of physics have been tested and proven by countless experiments.
   物理学的原理已经被无数的实验所验证和证明。