fundamental principle

It appears to me the worst instrument of arbitrary power, the most destructive of English liberty and the fundamental principles of law, that ever was found in an English lawbook.

看来，这是一本英国法律档案里所能找到的表明专制权力的最坏的文件。

Some theories related to particle scatterance and the structure as well as the fundamental principle of the facilities for testing laser signal from multiple angles have been introduced.

介绍了粒子散射相关理论以及光粒子信号多角度检测装置的构成与基本原理,并详细描述了对烟与干扰气溶胶粒子的多角度散射特征集、处理和分析的过程。